<PAGE>

                                 $109,375,000

                               CREDIT AGREEMENT

                         Dated as of December 31, 1997
                                      and
                   Amended and Restated as of June 25, 1999
                                      and
               Further Amended and Restated as of April 7, 2000

                                     among
                       Terra International (Canada) Inc.

                                  as Borrower
                          The Guarantors party hereto
                                      and
                           The Lenders Party Hereto
                                      and
                                Citibank, N.A.
                            as Administrative Agent
                             Bankers Trust Company
                            as Documentation Agent
                           Salomon Smith Barney Inc.

                       as Lead Arranger and Book Runner



                          Weil, Gotshal & Manges LLP
                               767 Fifth Avenue
                         New York, New York 10153-0119
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>    <C>      <C>         <C>                                                                      <C>
Article I       Definitions, Interpretation And Accounting Terms.....................................   2
       Section 1.1          Defined Terms............................................................   2
       Section 1.2          Computation of Time Periods..............................................  26
       Section 1.3          Accounting Terms and Principles..........................................  26
       Section 1.4          Certain Terms............................................................  26
Article II      Amounts and  Terms of The Advances...................................................  27
       Section 2.1          The Advances.............................................................  27
       Section 2.2          Repayment................................................................  27
       Section 2.3          Termination of the Commitments...........................................  27
       Section 2.4          Optional Prepayments.....................................................  27
       Section 2.5          Interest.................................................................  28
       Section 2.6          Conversion and Continuation of Advances..................................  28
       Section 2.7          Increased Costs, Illegality, Etc.........................................  30
       Section 2.8          Payments and Computations................................................  31
       Section 2.9          Taxes....................................................................  33
       Section 2.1          Sharing of Payments, Etc.................................................  35
       Section 2.1          Criminal Rate of Interest................................................  36
       Section 2.1          Replacement of Lenders...................................................  36
Article III     Conditions To Restatement............................................................  37
       Section 3.1          Conditions Precedent.....................................................  37
       Section 3.2          Borrower's Collateral Confirmation.......................................  41
Article IV      Representations and Warranties.......................................................  41
       Section 4.1          Corporate Existence; Compliance with Law.................................  41
       Section 4.2          Corporate Power; Authorization; Enforceable Obligations..................  42
       Section 4.3          Ownership of Subsidiaries................................................  42
       Section 4.4          Financial Statements.....................................................  43
       Section 4.5          Material Adverse Change..................................................  43
       Section 4.6          Solvency.................................................................  43
       Section 4.7          Litigation...............................................................  44
       Section 4.8          Taxes....................................................................  44
       Section 4.9          Full Disclosure..........................................................  44
       Section 4.10         Margin Regulations.......................................................  45
       Section 4.11         No Burdensome Restrictions; No Defaults..................................  45
</TABLE>

                                       i
<PAGE>

                               TABLE OF CONTENTS
                                  (continued)
<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>    <C>      <C>         <C>                                                                      <C>

       Section 4.12         Investment Company Act; Public Utility Holding Company Act ..............  45
       Section 4.13         Use of Proceeds..........................................................  45
       Section 4.14         Insurance................................................................  45
       Section 4.15         Labor Matters............................................................  46
       Section 4.16         ERISA....................................................................  46
       Section 4.17         Environmental Matters....................................................  47
       Section 4.18         Intellectual Property....................................................  48
       Section 4.19         Title; Real Property.....................................................  48
       Section 4.20         Year 2000 Compliance.....................................................  49
       Section 4.21         Canadian and English Requirements........................................  49
       Section 4.22         Pari Passu Obligations...................................................  50
       Section 4.23         No Immunity..............................................................  50
       Section 4.24         Canadian Employee Benefit Plans..........................................  50
Article V       Financial Covenants..................................................................  51
       Section 5.1          Minimum Cash Flow........................................................  51
       Section 5.2          Capital Expenditures, Common Unit Purchases and Joint Venture
                            Investments..............................................................  52
Article VI      Reporting Covenants..................................................................  52
       Section 6.1          Financial Statements.....................................................  52
       Section 6.2          Default Notices..........................................................  54
       Section 6.3          Litigation...............................................................  54
       Section 6.4          Asset Sales..............................................................  54
       Section 6.5          SEC Filings; Press Releases..............................................  54
       Section 6.6          Labor Relations..........................................................  54
       Section 6.7          Tax Returns..............................................................  55
       Section 6.8          Insurance................................................................  55
       Section 6.9          ERISA Matters............................................................  55
       Section 6.10         Environmental Matters....................................................  55
       Section 6.11         Other Information........................................................  56
       Section 6.12         Material Documents.......................................................  56
       Section 6.13         Foreign Benefit Plans....................................................  57
Article VII     Affirmative Covenants................................................................  57
</TABLE>
                                      ii
<PAGE>

                               TABLE OF CONTENTS
                                  (continued)
<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>    <C>      <C>         <C>                                                                      <C>
       Section 7.1          Preservation of Corporate Existence, Etc.................................  57
       Section 7.2          Compliance with Laws, Etc................................................  57
       Section 7.3          Conduct of Business......................................................  57
       Section 7.4          Payment of Taxes, Etc....................................................  57
       Section 7.5          Maintenance of Insurance.................................................  57
       Section 7.6          Access...................................................................  58
       Section 7.7          Keeping of Books.........................................................  58
       Section 7.8          Maintenance of Properties, Etc...........................................  58
       Section 7.9          Application of Proceeds..................................................  58
       Section 7.10         Environmental............................................................  59
       Section 7.11         Additional Collateral and Guaranties; Further Assurances.................  59
       Section 7.12         Cash Collateral Accounts and Cash Management System......................  61
       Section 7.13         Real Estate..............................................................  63
       Section 7.14         Hedging Contracts........................................................  64
Article VIII    Negative Covenants...................................................................  64
       Section 8.1          Indebtedness.............................................................  64
       Section 8.2          Liens, Etc...............................................................  65
       Section 8.3          Investments..............................................................  66
       Section 8.4          Sale of Assets...........................................................  67
       Section 8.5          Restricted Payments......................................................  68
       Section 8.6          Restriction on Fundamental Changes.......................................  69
       Section 8.7          Change in Nature of Business.............................................  70
       Section 8.8          Transactions with Affiliates.............................................  70
       Section 8.9          Restrictions on Subsidiary Distributions; No New Negative Pledge.........  70
       Section 8.10         Modification of Constituent Documents....................................  70
       Section 8.11         Modification of Material Documents.......................................  71
       Section 8.12         Subordinated Debt........................................................  71
       Section 8.13         Accounting Changes; Fiscal Year..........................................  71
       Section 8.14         Margin Regulations.......................................................  71
       Section 8.15         Operating Leases; Sale/Leasebacks........................................  71
       Section 8.16         Cancellation of Indebtedness Owed........................................  71
</TABLE>
                                      iii
<PAGE>

                               TABLE OF CONTENTS
                                  (continued)
<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>    <C>      <C>         <C>                                                                      <C>
       Section 8.17         No Speculative Transactions..............................................  72
       Section 8.18         Compliance with ERISA and Foreign Plans..................................  72
       Section 8.19         Environmental............................................................  72
       Section 8.20         Payments to Minority Interests...........................................  72
Article IX      Events of Default and Events of Failure..............................................  72
       Section 9.1          Events of Default........................................................  72
       Section 9.2          Remedies.................................................................  74
       Section 9.3          Rescission...............................................................  75
       Section 9.4          Events of Failure........................................................  75
Article X       The Guarantee........................................................................  75
       Section 10.1         The Guarantee............................................................  75
       Section 10.2         Obligations Unconditional................................................  76
       Section 10.3         Reinstatement............................................................  77
       Section 10.4         Subrogation..............................................................  77
       Section 10.5         Remedies.................................................................  77
       Section 10.6         Instrument for the Payment of Money......................................  77
       Section 10.7         Continuing Guarantee.....................................................  77
       Section 10.8         Rights of Contribution...................................................  77
       Section 10.9         General Limitation on Guarantee Obligations..............................  78
Article XI       The Administrative Agent............................................................  78
       Section 11.1         Authorization and Action.................................................  78
       Section 11.2         Administrative Agent's Reliance, Etc.....................................  79
       Section 11.3         The Administrative Agent Individually....................................  80
       Section 11.4         Lender Credit Decision...................................................  80
       Section 11.5         Indemnification..........................................................  80
       Section 11.6         Successor and Co-Administrative Agents...................................  80
       Section 11.7         Concerning the Collateral and the Collateral Documents...................  81
       Section 11.8         Collateral Matters Relating to Related Obligations.......................  82
Article XII      Miscellaneous.......................................................................  83
       Section 12.1         Amendments, Waivers, Etc.................................................  83
       Section 12.2         Assignments and Participations...........................................  85
       Section 12.3         Costs and Expenses.......................................................  87
</TABLE>
                                   iv
<PAGE>

                               TABLE OF CONTENTS
                                  (continued)
<TABLE>
<CAPTION>
                                                                                                     Page
                                                                                                     ----
<S>    <C>      <C>         <C>                                                                      <C>
       Section 12.4         Indemnities..............................................................  88
       Section 12.5         Limitation of Liability..................................................  89
       Section 12.6         Right of Set-off.........................................................  89
       Section 12.7         Notices, Etc.............................................................  89
       Section 12.8         No Waiver; Remedies......................................................  90
       Section 12.9         Binding Effect...........................................................  91
       Section 12.10        Governing Law............................................................  91
       Section 12.11        Submission to Jurisdiction; Service of Process...........................  91
       Section 12.12        Waiver of Jury Trial.....................................................  92
       Section 12.13        No Immunity..............................................................  92
       Section 12.14        Judgment Currency........................................................  92
       Section 12.15        Marshaling; Payments Set Aside...........................................  93
       Section 12.16        Section Titles...........................................................  93
       Section 12.17        Execution in Counterparts................................................  93
       Section 12.18        Entire Agreement.........................................................  93
       Section 12.19        Confidentiality..........................................................  93
       Section 12.20        Refund of Tax Credits....................................................  93
</TABLE>
                                   Schedules

<TABLE>
<CAPTION>
<S>             <C>  <C>
Schedule I           Applicable Lending Offices and Addresses for Notices
Schedule II     -    Projections
Schedule 4.2    -    Consents
Schedule 4.3    -    Ownership of Subsidiaries
Schedule 4.4    -    Pro Forma Balance Sheet
Schedule 4.7    -    Litigation
Schedule 4.8    -    Taxes
Schedule 4.15   -    Labor Matters
Schedule 4.16   -    List of Plans
Schedule 4.17   -    Environmental Matters
Schedule 4.19   -    Real Property
Schedule 7.12   -    Accounts
Schedule 8.1    -    Existing Indebtedness
Schedule 8.2    -    Existing Liens
Schedule 8.3    -    Existing Investments
</TABLE>
                                       v
<PAGE>

                               TABLE OF CONTENTS
                                  (continued)

                                    Exhibits

<TABLE>
<CAPTION>
<S>            <C>        <C>
Exhibit A      -          Form of Assignment and Acceptance
Exhibit B      -          Form of Note
Exhibit C      -          Forms of Opinions of Counsel for the Loan Parties
Exhibit D      -          Form of Loan Purchase Agreement
Exhibit E      -          Form of Pledge and Security Agreement
Exhibit F      -          Form of Intercreditor Agreement
Exhibit G      -          Form of UK Debenture
Exhibit H      -          Form of UK Assignment and Subordination Agreements
Exhibit I      -          Form of Terra Canada Junior General Security Agreement
</TABLE>
                                      vi
<PAGE>

          Credit Agreement, dated as of April 7, 2000, among Terra
International (Canada), Inc., an Ontario corporation (the "Borrower"), each of
the corporations and limited partnerships defined below as guarantors (the
"Guarantors"), each of the Lenders (as defined below) and Citibank, N.A.
("Citibank"), as agent for the Lenders (in such capacity, the "Administrative
Agent").

                             W I T N E S S E T H:

          Whereas, the Borrower, certain of the Guarantors, the Existing Lenders
(as defined below) and the Administrative Agent are parties to a Credit
Agreement dated as of December 31, 1997 and amended and restated as of March 31,
1998 and June 25 ,1999 (as in effect on the date hereof, the "Existing Credit
Agreement") pursuant to which the Existing Lenders made Advances (as defined
below) to the Borrower on December 31, 1997 in an aggregate principal amount
equal to $125,000,000; and

          Whereas, the Borrower has requested that the Lenders amend and restate
the Existing Credit Agreement, among other things (i) to modify certain
covenants contained therein and (ii) to make certain other changes to the
Existing Credit Agreement and the other Loan Documents, all on the terms and
conditions set forth herein, it being the intention of the parties hereto that
(i) the Advances outstanding under the Existing Credit Agreement on the
Restatement Date (as defined below) shall continue and remain outstanding and
not be repaid on the Restatement Date and (ii) the amendment and restatement of
the Existing Credit Agreement evidenced hereby shall not establish a new debt
obligation in substitution for, or a novation of, such outstanding Advances; and

          Whereas, effective immediately prior to the Restatement Date, the
Existing Lenders entered into an Assignment and Acceptance pursuant to which the
Existing Lenders assigned to the Lenders party hereto and such Lenders purchased
all of the Existing Lenders' rights under the Existing Credit Agreement,
including, without limitation, all of the Existing Lenders' rights in respect of
the Advances; and

          Whereas, on the Restatement Date (as defined below) Terra Capital,
Inc., Terra Nitrogen (U.K.) Limited and Terra Nitrogen, Limited Partnership, the
lenders and issuers party thereto and Citibank, as Administrative Agent shall
have entered into a Revolving and Term Credit Agreement (the "Revolving and Term
Credit Agreement"), pursuant to which, among other things, the Amended and
Restated Revolving and Term Credit Agreement dated as of June 25, 1999 among
Terra Capital, Inc., certain guarantors, certain lenders and issuing banks and
Citibank, as Administrative Agent, is to be refinanced in full (and terminated)
from proceeds of loans made under the Revolving and Term Credit Agreement;

          Now, Therefore, in consideration of the premises and the covenants and
agreements contained herein, the parties hereto hereby agree that the Existing
Credit Agreement shall (subject to the satisfaction of the conditions precedent
specified in Article III) be amended and restated in its entirety to read as set
forth herein:
<PAGE>

                                   ARTICLE I

               Definitions, Interpretation And Accounting Terms

          Section 1.1.    Defined Terms.  As used in this Agreement, the
                          -------------
following terms have the following meanings (such meanings to be equally
applicable to both the singular and plural forms of the terms defined). Terms
not otherwise defined in this Agreement have the meanings given in the Revolving
and Term Credit Agreement:

          "Account Triggering Event" means (a) with respect to the Borrower, the
occurrence of a Default (relating to the matters referred to in sections 9.1(f)
or (g)), an Event of Default, or a Liquidity Event of Failure and (b) with
respect to Terra UK, the occurrence of a Default (relating to the matters
referred to in sections 9.1(f) or (g) of the Revolving and Term Credit
Agreement), an Event of Default (as defined in the Revolving and Term Credit
Agreement), a Liquidity Event of Failure or any of the events specified in
Clause 5.3 of the Debenture.

          "Administrative Agent" has the meaning specified in the preamble to
this Agreement.

          "Administrative Agent's Account" means the account of the
Administrative Agent maintained at it office at 2 Penns Way, Suite 200, New
Castle, Delaware 19720, Account No. 368 52248, Attention:  Annemarie Pavco, or
such other account maintained by the Administrative Agent as may be designated
by it as such by written notice to the Borrower and the Lenders.

          "Affiliate" means, with respect to any Person, any other Person which,
directly or indirectly, controls, is controlled by or is under common control
with such Person, each officer, director, general partner or joint-venturer of
such Person, and each Person who is the beneficial owner of 10% or more of any
class of Voting Stock of such Person.  For the purposes of this definition,
"control" means the possession of the power to direct or cause the direction of
management and policies of such Person, whether through the ownership of voting
securities, by contract or otherwise.

          "Agreement" means this Credit Agreement.

          "Ammonium Nitrate Hedging Agreement" means an agreement dated December
31, 1997 between ICI Chemicals and Polymers Limited and the Borrower pursuant to
which the Borrower agrees to pay certain amounts to ICI Chemicals and Polymers
Limited by reference to ammonium nitrate prices.

          "Advances" has the meaning given in Section 2.1

          "Anglo American" means Anglo American plc, a company incorporated in
England and Wales with company number 03564138.

          "Anticipated Corporate Reorganization Transactions" means the
dissolution of Beaumont Methanol, substantially in accordance with the
reorganization structure set forth in Part II of Schedule 4.3, provided,
however, that 100% of the assets thereof shall continue to be beneficially owned
(directly or indirectly) by Terra Capital.

                                       2
<PAGE>

          "Applicable Lending Office" means, with respect to each Lender, its
Domestic Lending Office in the case of a Base Rate Advance, and its Eurodollar
Lending Office in the case of a Eurodollar Rate Advance.

          "Applicable Margin" means (a) during the period commencing on the
Restatement Date and ending on the first anniversary of the Restatement Date,
with respect to the Advances maintained as (i) Base Rate Advances, a rate equal
to 2.25% per annum and (ii) Eurodollar Rate Advances, a rate equal to 3.25% per
annum and (b) thereafter, as of any date of determination, a per annum rate
equal to the rate set forth below opposite the applicable type of Advance and
the then applicable Leverage Ratio (determined for the twelve-month period
ending on the last day of the most recent Fiscal Quarter or Fiscal Year, as
applicable, for which Financial Statements have been delivered pursuant to
Section 6.1) set forth below:

<TABLE>
<CAPTION>
----------------------------------------------------------
                            Base Rate      Eurodollar Rate
   Leverage Ratio            Advances          Advances
----------------------------------------------------------
<S>                   <C>               <C>
Greater than 5.0 to 1          2.25%             3.25%

----------------------------------------------------------
Less than or equal             2.00%             3.00%
 to 5.0 to 1 and
 greater than 4.0
 to 1
----------------------------------------------------------
Less than or equal             1.75%             2.75%
 to 4.0 to 1
----------------------------------------------------------
</TABLE>

Subsequent changes in the Applicable Margin resulting from a change in the
Leverage Ratio shall become effective as to all Advances one Business Day after
delivery by the Borrower to the Administrative Agent of new consolidated
financial statements pursuant to Section 6.1(b) for each of the first three
Fiscal Quarters of each Fiscal Year and Section 6.1(c) for each Fiscal Year.
Notwithstanding anything to the contrary set forth in this Agreement (including
the then effective Leverage Ratio), if the Borrower shall fail to deliver such
financial statements within the time periods specified in Section 6.1(b) or (c),
as applicable, the Applicable Margin from and including the 46th day after the
end of such Fiscal Quarter or the 91st day after the end of such Fiscal Year, as
the case may be, to but not including the date the Borrower deliver to the
Administrative Agent such financial statements shall equal the highest
Applicable Margin set forth above.

          "Approved Fund" means, with respect to any Lender that is a fund that
invests in bank loans, any other fund that invests in bank loans and is advised
or managed by the same investment advisor as such Lender or by an Affiliate of
such investment advisor.

          "Asset Sale" has the meaning specified in Section 8.4.

          "Assignment and Acceptance" means an assignment and acceptance entered
into by a Lender and an Eligible Assignee, and accepted by the Administrative
Agent, in substantially the form of Exhibit A.

          "Bailee's Letter" means a letter in form and substance acceptable to
the Administrative Agent executed by any Person (other than a Loan Party) who is
in possession of Inventory on behalf of an Obligor pursuant to which such Person
acknowledges, among other things, the Collateral Agent's Lien with respect
thereto.

                                       3
<PAGE>

          "Bankruptcy Code" means title 11, United States Code, as amended from
time to time.

          "Base Rate" means, for any period, a fluctuating interest rate per
annum as shall be in effect from time to time, which rate per annum shall be
equal at all times to the highest of:

          (a)    the rate of interest announced publicly by Citibank in New
     York, New York, from time to time, as Citibank's base rate;

          (b)    the sum (adjusted to the nearest 0.25% or, if there is no
     nearest 0.25%, to the next higher 0.25%) of (i) 0.5% per annum plus (ii)
     the rate per annum obtained by dividing (A) the latest three-week moving
     average of secondary market morning offering rates in the United States for
     three-month certificates of deposit of major United States money market
     banks, such three-week moving average being determined weekly on each
     Monday (or, if any such day is not a Business Day, on the next succeeding
     Business Day) for the three-week period ending on the previous Friday by
     Citibank on the basis of such rates reported by certificate of deposit
     dealers to and published by the Federal Reserve Bank of New York or, if
     such publication shall be suspended or terminated, on the basis of
     quotations for such rates received by Citibank from three New York
     certificate of deposit dealers of recognized standing selected by Citibank,
     by (B) a percentage equal to 100% minus the average of the daily
     percentages specified during such three-week period by the Federal Reserve
     Board for determining the maximum reserve requirement (including any
     emergency, supplemental or other marginal reserve requirement) for Citibank
     in respect of liabilities consisting of or including (among other
     liabilities) three-month U.S. dollar non personal time deposits in the
     United States, plus (iii) the average during such three-week period of the
     maximum annual assessment rates estimated by Citibank for determining the
     then current annual assessment payable by Citibank to the Federal Deposit
     Insurance Corporation (or any successor) for insuring Dollar deposits in
     the United States; and

          (c)    the sum of (i) 0.5% per annum plus (ii) the Federal Funds Rate.
          "Base Rate Advance" means any Advance that bears interest as provided
in Section 2.5(a)(i).

          "Beaumont Ammonia" means Beaumont Ammonia, Inc., a Delaware
corporation and Subsidiary of Terra UK Holdings.

          "Beaumont Holdings" means Beaumont Holdings Corporation, a Delaware
corporation and wholly owned Subsidiary of BMCH.

          "Beaumont Methanol" means Beaumont Methanol, Limited Partnership, a
Delaware limited partnership.

          "BMCH" means BMC Holdings, Inc., a Delaware corporation.

          "Business Day" means a day of the year on which banks are not required
or authorized to close in New York City and Toronto, Ontario, Canada and, if the
applicable Business Day relates to notices, determinations, fundings and
payments in connection with the

                                       4
<PAGE>

Eurodollar Rate or any Eurodollar Rate Advances, a day on which dealings in
Dollar deposits are also carried on in the London interbank market.

          "Canada" means the federal government of Canada and any agency,
ministry or board thereof.

          "Canadian Dollars" means the lawful money of Canada.

          "Canadian Employee Benefit Plan" means any employee benefit, pension,
retirement or other equivalent or analogous plan or program established or
maintained by the Borrower or any of its Canadian Subsidiaries.

          "Capital Expenditures" means, with respect to any Person for any
period, the aggregate of amounts that would be reflected as additions to
property, plant or equipment on a consolidated balance sheet of such Person and
its Subsidiaries prepared in conformity with GAAP, excluding interest
capitalized during construction.

          "Capital Lease" means, with respect to any Person, any lease of
property by such Person as lessee which would be accounted for as a capital
lease on a balance sheet of such Person prepared in conformity with GAAP.

          "Capital Lease Obligations" means, with respect to any Person, the
capitalized amount of all obligations of such Person or any of its Subsidiaries
under Capital Leases, as determined on a consolidated basis in conformity with
GAAP.

          "Cash Collateral Account" means the bank accounts identified as such
on Schedule 7.12 and each other account maintained from time to time by any Loan
Party with Citibank and designated a cash collateral account by Citibank.

          "Cash Equivalents" means (a) securities issued or fully guaranteed or
insured by the United States government, the United Kingdom government or the
Canadian government or any agency thereof, (b) certificates of deposit,
eurodollar time deposits, overnight bank deposits and bankers' acceptances of
any commercial bank organized under the laws of the United States, any state
thereof, the District of Columbia, any foreign bank, or its branches or agencies
(fully protected against currency fluctuations) which, at the time of
acquisition, are rated at least "A-1" by Standard & Poor's Rating Services
("S&P") or "P-1" by Moody's Investors Services, Inc. ("Moody's"), (c) commercial
paper of an issuer rated at least "A-1" by S&P or "P-1" by Moody's, (d) Canadian
Dollar denominated banker's acceptances of Canadian banks, and Canadian dollar
denominated commercial paper, rated at least R1-mid by Dominion Bond Rating
Service and (e) shares of any money market fund that (i) has at least 95% of its
assets invested continuously in the types of investments referred to in clauses
(a) through (c) above, (ii) has net assets of not less than $500,000,000 and
(iii) is rated at least "A-1" by S&P or "P-1" by Moody's; provided, however,
that the maturities of all obligations of the type specified in clauses (a) and
(d) above shall not exceed 1 year and in clauses (b) and (c) above shall not
exceed 270 days.

          "Cash Flow" means, with respect to Terra Industries and its
Subsidiaries for any period, an amount equal to EBITDA of Terra Industries and
its Subsidiaries for such period minus, to the extent not reflected in the
calculation of EBITDA, the sum of (i) TNCLP Minority Interest Payments and (ii)
provided such net cash amount is greater than zero, cash (net of cash

                                       5
<PAGE>

in-flows in respect thereof) used to finance obligations of discontinued
operations of Terra Industries and its Subsidiaries.

          "Change of Control" means any of the following:  (a) any person or
group of persons (within the meaning of the Securities Exchange Act of 1934, as
amended) shall have acquired beneficial ownership (within the meaning of Rule
13d-3 promulgated by the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended) of a greater percentage of the issued and
outstanding Voting Stock of Terra Industries than that held directly or
indirectly by Anglo American; (b) Anglo American shall cease to own beneficially
at least 20% of the issued and outstanding Voting Stock of Terra Industries; or
(c) during any period of twelve consecutive calendar months, individuals who at
the beginning of such period constituted the board of directors of Terra
Industries (together with any new directors whose election by the board of
directors of Terra Industries or whose nomination for election by the
stockholders of Terra Industries was approved by a vote of at least two-thirds
of the directors then still in office who either were directors at the beginning
of such period or whose elections or nomination for election was previously so
approved) cease for any reason other than death or disability to constitute a
majority of the directors then in office; provided, however, that the
appointment of any directors which are nominated by Anglo American in
replacement of then existing directors which were nominated by Anglo American
shall not itself constitute a Change of Control.

          "Citibank" has the meaning specified in the preamble to this
Agreement.

          "Code" means the Internal Revenue Code of 1986 (or any successor
legislation thereto), as amended from time to time.

          "Collateral" means all property and interests in property and proceeds
thereof now owned or hereafter acquired by any Loan Party in or upon which a
Lien is granted under any of the Collateral Documents.

          "Collateral Agent" has the meaning specified in the Intercreditor
Agreement.

          "Collateral Documents" means the Terra Canada Security Documents, the
Pledge and Security Agreement, the Debenture, the Mortgages, the Intercreditor
Agreement, the Terra UK Share Mortgage, the Junior Collateral Documents and any
other document executed and delivered by a Loan Party granting a Lien on any of
its property to secure payment of the Obligations.

          "Common Units" means the common units issued and outstanding under the
Agreement of Limited Partnership dated as of December 4, 1991 of TNCLP.

          "Compliance Certificate" has the meaning specified in Section 6.1(d).

          "Consolidated Net Income" means, for any Person for any period, the
net income (or loss) of such Person and its Subsidiaries for such period,
determined on a consolidated basis in conformity with GAAP; provided, however,
that (a) the net income of any other Person in which such Person or one of its
Subsidiaries has a joint interest with a third party (which interest does not
cause the net income of such other Person to be consolidated into the net income
of such Person in accordance with GAAP) shall be included only to the extent of
the amount of dividends or distributions paid to such Person or Subsidiary, (b)
the net income of any Subsidiary of such Person that is subject to any
restriction or limitation on the payment of dividends or the making of

                                       6
<PAGE>

other distributions shall be excluded to the extent of such restriction or
limitation, and (c) any one-time increase or decrease to net income which is
required to be recorded because of the adoption of new accounting policies,
practices or standards required by GAAP shall be excluded.

          "Constituent Documents" means, with respect to any Person, (i) the
articles/certificate of incorporation (or the equivalent organizational
documents) of such Person, (ii) the by-laws (or the equivalent governing
documents) of such Person and (iii) any document setting forth the manner of
election and duties of the directors or managing members of such Person (if any)
and the designation, amount and/or relative rights, limitations and preferences
of any class or series of such Person's Stock.

          "Contaminant" means any material, substance or waste that is
classified, regulated or otherwise characterized under any Environmental Law as
hazardous, toxic, a contaminant or a pollutant or by other words of similar
meaning or regulatory effect, including any petroleum or petroleum-derived
substance or waste, asbestos and polychlorinated biphenyls.

          "Continuation", "Continue" and "Continued" each refers to a
continuation of Eurodollar Rate Advances from one Interest Period to the next
Interest Period pursuant to Section 2.6

          "Contractual Obligation" of any Person means any obligation,
agreement, undertaking or similar provision of any Security issued by such
Person or of any agreement, undertaking, contract, lease, indenture, mortgage,
deed of trust or other instrument (excluding any Loan Document but including any
Material Document) to which such Person is a party or by which it or any of its
property is bound or to which any of its properties is subject.

          "Conversion", "Convert" and "Converted" each refers to a conversion of
Advances of one Type into Advances of the other Type pursuant to Section 2.6.

          "Customary Permitted Liens" means, with respect to any Person, any of
the following Liens:

          (a)    Liens with respect to the payment of taxes, customs duties,
     assessments or governmental charges in all cases which are not yet due or
     which are being contested in good faith by appropriate proceedings and with
     respect to which adequate reserves or other appropriate provisions are
     being maintained to the extent required by GAAP;

          (b)    Liens of landlords arising by statute and liens of suppliers,
     mechanics, carriers, materialman, warehousemen or workmen and other liens
     imposed by law created in the ordinary course of business for amounts not
     yet due or which are being contested in good faith by appropriate
     proceedings and with respect to which adequate reserves or other
     appropriate provisions are being maintained to the extent required by GAAP;

          (c)    deposits made in the ordinary course of business in connection
     with worker's compensation, unemployment insurance or other types of social
     security benefits or to secure the performance of bids, tenders, sales,
     contracts (other than for the repayment of borrowed money) and surety,
     appeal, customs or performance bonds;

          (d)    encumbrances arising by reason of zoning restrictions,
     easements, licenses, reservations, covenants, rights-of-way, utility
     easements, building restrictions

                                       7
<PAGE>

     and other similar encumbrances on the use of real property which do not
     materially detract from the value of such real property or interfere with
     the ordinary conduct of the business conducted and proposed to be conducted
     at such real property;

          (e)    encumbrances arising under leases or subleases of real property
     which do not in the aggregate materially detract from the value of such
     real property or interfere with the ordinary conduct of the business
     conducted and proposed to be conducted at such real property;

          (f)    financing statements of a lessor's rights in and to personal
     property leased to such Person in the ordinary course of such Person's
     business;

          (g)    expired financing statements and financing statements filed for
     precautionary purposes in respect of operating leases; and

          (h)    Liens in favor of banks which arise under Article 4 of the New
     York UCC on items in collection and documents relating thereto and proceeds
     thereof.

          "Debt Issuance" means the incurrence of Indebtedness of the type
specified in clause (a) and (b) of the definition of "Indebtedness" by Terra
Industries or any of its Subsidiaries.

          "Debenture" means the English law Debenture dated as of the
Restatement Date, substantially in the form of Exhibit G, executed by Terra UK
in favor of the Collateral Agent.

          "Default" means any event which with the passing of time or the giving
of notice or both would become an Event of Default.

          "Disbursement Accounts" means the bank accounts identified as such on
Schedule 7.12 and each other account maintained from time to time by the
Borrower, Terra Capital, Terra UK and TNLP with a bank acceptable to the
Administrative Agent for the purposes of paying disbursements.

          "Dollar Equivalent" means with respect to any amount denominated in a
currency other than Dollars, at the time of determination thereof, the
equivalent of such currency in Dollars determined by using the rate of exchange
quoted by Citibank in New York, New York at 11:00 a.m. (New York time) on the
date of determination to prime banks in New York for the spot purchase in the
New York foreign exchange market of such amount of Dollars with such other
currency.

          "Dollars" and the sign "$" each mean the lawful money of the United
States of America.

          "Domestic Lending Office" means, with respect to any Lender, the
office of such Lender specified as its "Domestic Lending Office" opposite its
name on Schedule I or on the Assignment and Acceptance by which it became a
Lender or such other office of such Lender (or an Affiliate of such Lender) as
such Lender may from time to time specify to the Borrower and the Administrative
Agent.

                                       8
<PAGE>

          "Domestic Subsidiary" means any Subsidiary of Terra Industries
organized under the laws of any state of the United States of America or the
District of Columbia.

          "EBITDA" means, with respect to any Person for any period, an amount
equal to (a) Consolidated Net Income of such Person for such period plus (b) the
sum of, in each case to the extent included in the calculation of such
Consolidated Net Income but without duplication, (i) any provision for income
taxes, (ii) interest expense including net costs under Interest Rate Contracts,
(iii) loss from extraordinary items, (iv) any aggregate net loss from the sale,
exchange or other disposition of capital assets by such Person, (v) any other
non-cash loss or other items, (vi) depreciation, depletion and amortization of
intangibles or financing or acquisition costs and (vii) income allocation to
minority interests minus (c) the sum of, in each case to the extent included in
the calculation of such Consolidated Net Income but without duplication, (i) any
credit for income tax, (ii) interest income, (iii) gains from extraordinary
items for such period, (iv) any aggregate net gain from the sale, exchange or
other disposition of capital assets by such Person, (v) any other non-cash gains
or other items and (vi) loss allocation to minority interests.

          "Eligible Assignee" means (a) a Lender or any Affiliate or Approved
Fund of such Lender; (b) a commercial bank having total assets in excess of
$5,000,000,000; (c) a finance company, insurance company, other financial
institution or fund reasonably acceptable to the Administrative Agent, which is
regularly engaged in making, purchasing or investing in loans including, with
respect to any proposed assignment of all or a portion of a Lender's Commitment,
revolving loans, and having total assets in excess of $250,000,000 or, to the
extent assets are less than such amount, a finance company, insurance company,
other financial institution or fund, reasonably acceptable to the Administrative
Agent and the Borrower; or (d) a savings and loan association or savings bank
organized under the laws of the United States or any State thereof which has a
net worth, determined in accordance with GAAP, in excess of $250,000,000.

          "Environmental Laws" means all applicable Requirements of Law now or
hereafter in effect, as amended or supplemented from time to time, relating to
pollution or the regulation or protection of occupational health and safety, the
environment or natural resources, including the Comprehensive Environmental
Response, Compensation, and Liability Act of 1980, as amended (42 U.S.C. (S)
9601 et seq.); the Hazardous Material Transportation Act, as amended (49 U.S.C.
(S) 180 et seq.); the Federal Insecticide, Fungicide, and Rodenticide Act, as
amended (7 U.S.C. (S) 136 et seq.); the Resource Conservation and Recovery Act,
as amended (42 U.S.C. (S) 6901 et seq.); the Toxic Substance Control Act, as
amended (42 U.S.C. (S) 7401 et seq.); the Clean Air Act, as amended (42 U.S.C.
(S) 740 et seq.); the Federal Water Pollution Control Act, as amended (33 U.S.C.
(S) 1251 et seq.); the Occupational Safety and Health Act, as amended (29 U.S.C.
(S) 651 et seq.); the Safe Drinking Water Act, as amended (42 U.S.C. (S) 300f et
seq.); the Environmental Protection Act (Ontario); the Canadian Environmental
Protection Act; the Ontario Water Resources Act; and their state and local
counterparts or equivalents and any transfer of ownership notification or
approval statute, including the Industrial Site Recovery Act (N.J. Stat. Ann.
(S) 13:1K-6 et seq.) and any similar or equivalent Requirement of Law of any
relevant jurisdiction.

          "Environmental Liabilities and Costs" means, with respect to any
Person, all liabilities, obligations, responsibilities, Remedial Actions,
losses, damages, punitive damages, consequential damages, treble damages, costs
and expenses (including all fees, disbursements and expenses of counsel, experts
and consultants and costs of investigation and feasibility studies), fines,
penalties, sanctions and interest incurred as a result of any claim or demand by
any other Person, whether based in contract, tort, implied or express warranty,
strict liability, criminal or

                                       9
<PAGE>

civil statute, including any thereof arising under any Environmental Law,
Permit, order or agreement with any Governmental Authority or other Person,
which relate to any environmental, health or safety condition or a Release or
threatened Release, and result from the past, present or future operations of,
or ownership of property by, such Person or any of its Subsidiaries.

          "Environmental Lien" means any Lien in favor of any Governmental
Authority for Environmental Liabilities and Costs.

          "Equity Issuance" means the issue or sale of any Stock of Terra
Industries, any Loan Party or any Subsidiary of any of the foregoing.

          "ERISA" means the Employee Retirement Income Security Act of 1974 (or
any successor legislation thereto), as amended from time to time.

          "ERISA Affiliate" means any trade or business (whether or not
incorporated) under common control or treated as a single employer with the
Borrower or any of its Material Subsidiaries within the meaning of Section 414
(b), (c), (m) or (o) of the Code.

          "ERISA Event" means (i) a reportable event described in Section
4043(b) or 4043(c)(1), (2), (3), (5), (6), (8) or (9) of ERISA with respect to a
Title IV Plan or a Multiemployer Plan as to which the 30 day notice requirement
has not been waived under applicable regulations; (ii) the withdrawal of the
Borrower, any of its Subsidiaries or any ERISA Affiliate from a Title IV Plan
subject to Section 4063 of ERISA during a plan year in which it was a
substantial employer, as defined in Section 4001(a)(2) of ERISA; (iii) the
complete or partial withdrawal of the Borrower, any of its Subsidiaries or any
ERISA Affiliate from any Multiemployer Plan; (iv) notice of reorganization or
insolvency of a Multiemployer Plan; (v) the filing of a notice of intent to
terminate a Title IV Plan or the treatment of a plan amendment as a termination
under Section 4041 of ERISA; (vi) the institution of proceedings to terminate a
Title IV Plan or Multiemployer Plan by the PBGC; (vii) the failure to make any
required contribution to a Title IV Plan or Multiemployer Plan; (viii) the
imposition of a lien under Section 412 of the Code or Section 302 of ERISA on
the Borrower or any of its Subsidiaries or any ERISA Affiliate; or (ix) any
other event or condition which might reasonably be expected to constitute
grounds under Section 4042 of ERISA for the termination of, or the appointment
of a trustee to administer, any Title IV Plan or Multiemployer Plan or the
imposition of any liability under Title IV of ERISA, other than for PBGC
premiums due but not delinquent under Section 4007 of ERISA.

          "Eurocurrency Liabilities" has the meaning assigned to that term in
Regulation D of the Federal Reserve Board, as in effect from time to time.

          "Eurodollar Base Rate" means the rate determined by the Administrative
Agent to be the offered rate for deposits in Dollars for the applicable Interest
Period which appears on the Dow Jones Markets Telerate Page 3750 as of 11:00
a.m., London time, on the second full Business Day next preceding the first day
of each Interest Period.  In the event that such rate does not appear on the Dow
Jones Markets Telerate Page 3750 (or otherwise on the Dow Jones Markets screen),
the Eurodollar Base Rate for the purposes of this definition shall be determined
by reference to such other comparable publicly available service for displaying
eurodollar rates as may be selected by the Administrative Agent, or, in the
absence of such availability, the Eurodollar Base Rate shall be the rate of
interest determined by the Administrative Agent to be the rate per annum at
which deposits in Dollars are offered by the principal office of Citibank in

                                       10
<PAGE>

London to major banks in the London interbank market at 11:00 A.M. (London time)
two Business Days before the first day of such Interest Period in an amount
substantially equal to the Eurodollar Rate Loan of Citibank for a period equal
to such Interest Period.

          "Eurodollar Lending Office" means, with respect to any Lender, the
office of such Lender specified as its "Eurodollar Lending Office" opposite its
name on Schedule II or on the Assignment and Acceptance by which it became a
Lender (or, if no such office is specified, its Domestic Lending Office) or such
other office of such Lender (or an Affiliate of such Lender) as such Lender may
from time to time specify to the Borrower and the Administrative Agent.

          "Eurodollar Rate" means, with respect to any Interest Period for any
Eurodollar Rate Loan, an interest rate per annum equal to the rate per annum
obtained by dividing (a) the Eurodollar Base Rate by (b) a percentage equal to
100% minus the reserve percentage applicable two Business Days before the first
day of such Interest Period under regulations issued from time to time by the
Federal Reserve Board for determining the maximum reserve requirement (including
any emergency, supplemental or other marginal reserve requirement) for a member
bank of the Federal Reserve System in New York City with respect to liabilities
or assets consisting of or including Eurocurrency Liabilities (or with respect
to any other category of liabilities which includes deposits by reference to
which the Eurodollar Rate is determined) having a term equal to such Interest
Period.

          "Eurodollar Rate Advance" means an Advance that bears interest as
provided in Section 2.5(a)(ii).

          "Event of Default" has the meaning specified in Section 9.1.

          "Event of Failure" means any of the events described in Section 9.4.

          "Existing Advances" means the "Advances" under, and as defined in, the
Existing Credit Agreement outstanding as of the Restatement Date as specified in
Section 2.1

          "Existing Credit Agreement" has the meaning specified in the preamble
to this Agreement.

          "Existing Lender" means each Person that is a "Lender" party to the
Existing Credit Agreement on the Restatement Date.

          "Existing Notes" means the "Notes" under, and as defined in, the
Existing Credit Agreement outstanding on the Restatement Date.

          "Fair Market Value" means (a) with respect to any asset or group of
assets (other than a marketable Security) at any date, the value of the
consideration obtainable in a sale of such asset at such date assuming a sale by
a willing seller to a willing purchaser dealing at arm's length and arranged in
an orderly manner over a reasonable period of time having regard to the nature
and characteristics of such asset, as reasonably determined by the Board of
Directors of the applicable Loan Party, or, if such asset shall have been the
subject of a relatively contemporaneous appraisal by an independent third party
appraiser, the basic assumptions underlying which have not materially changed
since its date, the value set forth in such appraisal, and (b) with respect to
any marketable Security at any date, the closing sale price of such Security on
the Business Day next preceding such date, as appearing in any published list of
any national

                                       11
<PAGE>

securities exchange or the Nasdaq Stock Market or, if there is no such closing
sale price of such Security, the final price for the purchase of such Security
at face value quoted on such business day by a financial institution of
recognized standing which regularly deals in securities of such type selected by
the Administrative Agent.

          "Federal Funds Rate" means, for any period, a fluctuating interest
rate per annum equal for each day during such period to the weighted average of
the rates on overnight Federal funds transactions with members of the Federal
Reserve System arranged by Federal funds brokers, as published for such day (or,
if such day is not a Business Day, for the next preceding Business Day) by the
Federal Reserve Bank of New York, or, if such rate is not so published for any
day which is a Business Day, the average of the quotations for such day on such
transactions received by the Administrative Agent from three Federal funds
brokers of recognized standing selected by it.

          "Federal Reserve Board" means the Board of Governors of the Federal
Reserve System, or any successor thereto.

          "Financial Statements" means the financial statements of Terra
Industries and its Subsidiaries delivered in accordance with Sections 4.4 and
6.1.

          "Fiscal Quarter" means each of the three month periods ending on March
31, June 30, September 30 and December 31.

          "Fiscal Year" means the twelve month period ending on December 31.

          "Foreign Plans" means each Canadian Employee Benefit Plan and each
other retirement plan (including any statutory severance obligation requiring a
payment upon an employee's termination of employment for any reason other than
"cause" based upon an employee's length of service) which is not subject to
reporting in accordance with GAAP and Financial Accounting Standard Bulletin No.
87 or 106 and as to which Terra Industries or any of its Subsidiaries has any
obligation or liability, contingent or otherwise.

          "GAAP" means generally accepted accounting principles in the United
States of America as in effect from time to time set forth in the opinions and
pronouncements of the Accounting Principles Board and the American Institute of
Certified Public Accountants and the statements and pronouncements of the
Financial Accounting Standards Board, or in such other statements by such other
entity as may be in general use by significant segments of the accounting
profession, which are applicable to the circumstances as of the date of
determination.

          "Governmental Authority" means any nation or government, any state or
other political subdivision thereof and any entity exercising executive,
legislative, judicial, regulatory or administrative functions of or pertaining
to government.

          "Guarantor" means Terra Industries and each of its Subsidiaries listed
as a "Guarantor" on the signature pages hereto (other than, until such time as
it becomes directly, or indirectly, a wholly-owned subsidiary of Terra
Industries, TNLP).

          "Guaranty" means each guaranty executed, or given pursuant to Section
10.1, by the Guarantors and any other guaranty which may be executed by a Loan
Party from time to time in respect of the Obligations of Terra Canada.

                                       12
<PAGE>

          "Guaranteed Obligations" has the meaning specified in Section 10.1.

          "Guaranty Obligation" means, as applied to any Person, any direct or
indirect liability, contingent or otherwise, of such Person with respect to any
Indebtedness of another Person, if the purpose or intent of such Person in
incurring the Guaranty Obligation is to provide assurance to the obligee of such
Indebtedness that such Indebtedness will be paid or discharged, or that any
agreement relating thereto will be complied with, or that any holder of such
Indebtedness will be protected (in whole or in part) against loss in respect
thereof including, (a) the direct or indirect guaranty, endorsement (other than
for collection or deposit in the ordinary course of business), co-making,
discounting with recourse or sale with recourse by such Person of Indebtedness
of another Person and (b) any liability of such Person for Indebtedness of
another Person through any agreement (contingent or otherwise) (i) to purchase,
repurchase or otherwise acquire such Indebtedness or any security therefor, or
to provide funds for the payment or discharge of such Indebtedness (whether in
the form of a loan, advance, stock purchase, capital contribution or otherwise),
(ii) to maintain the solvency or any balance sheet item, level of income or
financial condition of another Person, (iii) to make take-or-pay or similar
payments, if required, regardless of non-performance by any other party or
parties to an agreement, (iv) to purchase, sell or lease (as lessor or lessee)
property, or to purchase or sell services, primarily for the purpose of enabling
the debtor to make payment of such Indebtedness or to assure the holder of such
Indebtedness against loss, or (v) to supply funds to or in any other manner
invest in such other Person (including to pay for property or services
irrespective of whether such property is received or such services are
rendered), if in the case of any agreement described under subclause (i), (ii),
(iii), (iv) or (v) of clause (b) of this sentence the primary purpose or intent
thereof is as described in the preceding sentence.  The amount of any Guaranty
Obligation shall be equal to the amount of the Indebtedness so guaranteed or
otherwise supported.

          "Hedging Contracts" means all Interest Rate Contracts, foreign
exchange contracts, currency swap or option agreements, forward contracts,
commodity swap, purchase or option agreements, other commodity price hedging
arrangements, and all other similar agreements or arrangements designed to alter
the risks of any Person arising from fluctuations in interest rates, currency
values or commodity prices.

          "Indebtedness" of any Person means without duplication (a) all
indebtedness of such Person for borrowed money,  (b) all obligations of such
Person evidenced by notes, bonds, debentures or similar instruments or which
bear interest, (c) all reimbursement and all obligations with respect to letters
of credit, bankers' acceptances, surety bonds and performance bonds, whether or
not matured, (d) all indebtedness for the deferred purchase price of property or
services, other than trade payables and accrued expenses incurred in the
ordinary course of business which are not overdue, (e) all indebtedness of such
Person created or arising under any conditional sale or other title retention
agreement with respect to property acquired by such Person (even though the
rights and remedies of the seller or lender under such agreement in the event of
default are limited to repossession or sale of such property), (f) all Capital
Lease Obligations and Major Operating Lease Obligations of such Person, (g) all
Guaranty Obligations of such Person, (h) all obligations of such Person to
purchase, redeem, retire, defease or otherwise acquire for value any Stock or
Stock Equivalents of such Person, valued, in the case of redeemable preferred
stock, at the greater of its voluntary or involuntary liquidation preference
plus accrued and unpaid dividends, (i) all payments that such Person would have
to make in the event of an early termination on the date Indebtedness of such
Person is being determined in respect of Hedging Contracts of such Person and
(j) all Indebtedness referred to above secured

                                       13
<PAGE>

by (or for which the holder of such Indebtedness has an existing right,
contingent or otherwise, to be secured by) any Lien upon or in property
(including accounts and general intangibles as such terms are defined in the New
York UCC) owned by such Person, even though such Person has not assumed or
become liable for the payment of such Indebtedness.

          "Indemnitees" has the meaning specified in Section 12.4.

          "Indentures" means the 10-3/4% Senior Note Indenture dated October 15,
1993 between Terra Industries (as successor to AMCI) and Society National Bank
and the 10-1/2% Senior Note Indenture dated June 22, 1995 between Terra
Industries and First Trust National Association.

          "Instrument" means any "instrument," as such term is defined in
Section 9-105(1)(i) of the New York UCC, now owned or hereafter acquired by any
Loan Party other than instruments that constitute, or are a part of a group of
writings that constitute, Chattel Paper.

          "Intercompany Indebtedness" means Indebtedness owed by Terra
Industries or one of its Subsidiaries to Terra Industries or one of its
Subsidiaries.

          "Intercreditor Agreement" means the amended and restated collateral
agency and intercreditor agreement substantially in the form of Exhibit F among
certain Loan Parties, the Administrative Agent, the Revolving and Term
Administrative Agent, the Collateral Agent and certain Lenders.

          "Interest Period" means, in the case of any Eurodollar Rate Advance,
(a) initially, the period commencing on the date such Eurodollar Rate Advance is
made or on the date of Conversion of a Base Rate Advance to such Eurodollar Rate
Advance and ending one, two, three or six months thereafter, as selected by a
Borrower in its notice of Conversion or Continuation given to the Administrative
Agent pursuant to Section 2.6 (a) or (c), and (b) thereafter, if such Advance is
Continued, in whole or in part, as a Eurodollar Rate Advance pursuant to Section
2.6(c), a period commencing on the last day of the immediately preceding
Interest Period therefor and ending one, two, three or six months thereafter, as
selected by the Borrower in its notice of Conversion or Continuation given to
the Administrative Agent pursuant to Section 2.6; provided, however, that all of
the foregoing provisions relating to Interest Periods in respect of Eurodollar
Rate Advances are subject to the following:

               (i)    if any Interest Period would otherwise end on a day which
     is not a Business Day, such Interest Period shall be extended to the next
     succeeding Business Day, unless the result of such extension would be to
     extend such Interest Period into another calendar month, in which event
     such Interest Period shall end on the immediately preceding Business Day;

               (ii)   any Interest Period that begins on the last Business Day
     of a calendar month (or on a day for which there is no numerically
     corresponding day in the calendar month at the end of such Interest Period)
     shall end on the last Business Day of a calendar month;

               (iii)  no Borrower may select any Interest Period that ends after
     the Maturity Date;

                                       14
<PAGE>

               (iv)   there shall be outstanding at any one time no more than
     three Interest Periods in the aggregate; and

               (v)    the Borrower may not select any Interest Period in respect
     of Advances having an aggregate principal amount of less than $5,000,000.

          "Interest Rate Contracts" means all interest rate swap agreements,
interest rate cap agreements, interest rate collar agreements and interest rate
insurance.

          "Investment" means, with respect to any Person, (a) any purchase or
other acquisition by that Person of (i) any Security issued by, (ii) a
beneficial interest in any Security issued by, or (iii) any other equity
ownership interest in, any other Person, (b) any purchase by that Person of all
or a significant part of the assets of a business conducted by another Person,
(c) any loan, advance (other than prepaid expenses, accounts receivable and
similar items made or incurred in the ordinary course of business as presently
conducted), or capital contribution by that Person to any other Person,
including all Indebtedness to such Person arising from a sale of property by
such Person other than in the ordinary course of its business and (d) any
deposit with a financial institution.

          "IRS" means the Internal Revenue Service of the United States or any
successor thereto.

          "Junior Collateral Documents" means (i) in respect of TNLP's
obligations for the TNLP Debt, the Junior Pledge and Security Agreement
(substantially in the form of Exhibit E-2) and related junior mortgages, each
dated as of the Restatement Date among TNLP, Terra Capital and the Collateral
Agent, (ii) in respect of Terra UK's obligations for the Terra UK Debt, the
debenture dated December 31, 1997 executed by Terra UK in favor of Terra UK
Holdings and the related Assignment Agreement and Subordination Agreement
(substantially in the form of Exhibits H-1 and H-2) each dated as of the
Restatement Date among Terra UK Holdings, Terra UK and the Collateral Agent and
(iii) in respect of the Terra Canada Junior Guaranty, the Junior General
Security Agreement (substantially in the form of Exhibit I) and related junior
mortgages each dated as of the Restatement Date among Terra Canada, Terra UK
Holdings and the Collateral Agent, each of the foregoing being assigned to the
Collateral Agent.

          "Junior Loan Documents" means (i) in respect of the TNLP Debt, an
amended and restated demand promissory note dated the date hereof issued by TNLP
in favor of Terra Capital and (ii) in respect of the Terra UK Debt, a credit
agreement dated December 31, 1997 between Terra UK as borrower and Terra UK
Holdings as lender and a promissory note dated December 31, 1997 and amended and
restated on the date hereof issued by Terra UK in favor of Terra UK Holdings and
the Terra Canada Junior Guaranty dated the date hereof,. each of the foregoing
being assigned to the Collateral Agent.

          "Landlord Waiver" means a letter in form and substance reasonably
acceptable to the Administrative Agent, executed by a landlord in respect of
Inventory of any Borrowing Base Contributor located at any leased premises of
such Borrowing Base Contributor pursuant to which such landlord, among other
things, waives or subordinates any Lien such landlord may have in respect of
such Inventory.

                                       15
<PAGE>

          "Leases" means, with respect to any Person, all of those leasehold
estates in real property of such Person, as lessee, as such may be amended,
supplemented or otherwise modified from time to time.

          "Lender" means each financial institution or other entity that (a) is
listed on the signature pages hereof as a "Lender" or (b) from time to time
becomes party hereto by execution of an Assignment and Acceptance.

          "Leverage Ratio" means, with respect to any Person for any period, the
ratio of (a) Indebtedness of the type specified in clauses (a), (b), (d), (e),
(f) and (h) of the definition of "Indebtedness" of such Person as of the last
day of such period to (b) Cash Flow for such Person for such period.

          "Lien" means any mortgage, deed of trust, pledge, hypothecation,
assignment, charge, deposit arrangement, encumbrance, lien (statutory or other),
security interest or preference, priority or other security agreement or
preferential arrangement of any kind or nature whatsoever intended to assure
payment of any Indebtedness or other obligation, including any conditional sale
or other title retention agreement, the interest of a lessor under a Capital
Lease, any financing lease having substantially the same economic effect as any
of the foregoing, and the filing of any financing statement under the Uniform
Commercial Code or comparable law of any jurisdiction naming the owner of the
asset to which such Lien relates as debtor but excluding any right of set-off.

          "Liquidity Event of Failure" means any time at which the aggregate
Available Credit (as defined in the Revolving and Term Credit Agreement) has
been less than $10,000,000 for at least five successive days.

          "Loan Documents" means, collectively, this Agreement, any Notes, each
Guaranty, the Fee Letter, the Revolving and Term Credit Agreement, the Loan
Documents (as defined in the Revolving and Term Credit Agreement, the Loan
Purchase Agreement, each Assignment and Acceptance, the Collateral Documents,
the Junior Loan Documents and each certificate, agreement or document executed
by a Loan Party and delivered to the Administrative Agent or any Lender in
connection with or pursuant to any of the foregoing.

          "Loan Party" means the Borrower, each Guarantor and each other
Subsidiary of Terra Industries that executes and delivers a Loan Document.

          "Loan Purchase Agreement" means the Loan Purchase Agreement dated as
of the Restatement Date between the Administrative Agent and Terra Industries in
substantially the form of Exhibit D.

          "Lockbox" has the meaning specified in the Lockbox Agreement.

          "Lockbox Accounts" means each bank account identified as such on
Schedule 7.12 and such other receivables collection accounts from time to time
maintained with a bank acceptable to the Administrative Agent and subject to a
Lockbox Agreement.

          "Lockbox Agreement" means, with respect to any Loan Party, the
agreement between each financial institution with which such Loan Party shall
have established a Lockbox Account (or any deposit or other account into which
proceeds of Accounts are deposited) and the

                                       16
<PAGE>

Administrative Agent, substantially in the form of Annex I to the Pledge and
Security Agreement (with such changes thereto as are satisfactory to the
Administrative Agent), as such agreements may be amended from time to time in
accordance with the terms thereof.

          "Major Operating Lease Obligations" means, in respect of any Person,
all obligations of such Person under an operating lease to pay required
termination payments or like payments in an amount exceeding $7,000,000 and in
an amount at least equal to 75% of the original acquisition cost of the property
leased thereunder.

          "Management Agreements" means each management agreement between Terra
Industries and/or any of its Subsidiaries and other Persons providing for the
performance by Terra Industries or any such Subsidiary of certain treasury,
purchasing, legal and/or other services for its Subsidiaries and such other
Persons, or such agreements are in effect from time to time.

          "Material Adverse Change" means a material adverse change in any of
(a) the business, condition (financial or otherwise), operations, performance or
properties of the Borrower, individually, or Terra Industries and its
Subsidiaries, taken as a whole, (b) the legality, validity or enforceability of
any Loan Document, (c) the perfection or priority of the Liens granted pursuant
to the Collateral Documents (except as expressly permitted hereby or thereby),
(d) the ability of the Borrower to repay the Obligations or of the Loan Parties
to perform their obligations under the Loan Documents, or (e) the rights and
remedies of the Administrative Agent, the Collateral Agent or the Lenders under
the Loan Documents.

          "Material Adverse Effect" means an effect that results in or causes,
or could reasonably be expected to result in or cause, (i) at any time up to and
including the Restatement Date, a Pre-Closing Material Adverse Change or (ii) at
any time following the Restatement Date, a Material Adverse Change.

          "Material Documents" means the Management Agreements, the Indentures,
the Ammonium Nitrate Hedging Agreement and the sale and leaseback agreement
entered into pursuant to the Permitted Sale Leaseback Transaction (if any).

          "Material Subsidiary" means, at any time, the Borrower, TNCLP, TNLP,
each Guarantor and any direct or indirect Subsidiary of Terra Industries owning
at least $500,000 of assets or generating at least $100,000 gross income for the
Fiscal Year of Terra Industries most recently ended.

          "Maturity Date" means January 2, 2003 or, if such date is not a
Business Day, the next succeeding Business Day.

          "Mortgage" means a mortgage, deed of trust or other real estate
security document made or required herein to be made by any Loan Party, pursuant
to which such Loan Party grants to the Collateral Agent a first priority Lien
(subject only to Customary Permitted Liens) on Real Property .

          "Mortgagee Waiver" means a letter in form and substance reasonably
acceptable to the Administrative Agent, executed by a mortgagee in respect of
Inventory of any Borrowing Base Contributor located at any mortgaged premises of
such Borrowing Base Contributor.

                                       17
<PAGE>

          "Multiemployer Plan" means a multiemployer plan, as defined in Section
4001(a)(3) of ERISA, to which Terra Industries, any of its Subsidiaries or any
ERISA Affiliate has any obligation or liability, contingent or otherwise.

          "Net Cash Proceeds" means (a) proceeds received by Terra Industries or
its Subsidiaries after the Restatement Date in cash or Cash Equivalents from any
Asset Sale, other than Asset Sales permitted under clauses (a) through (e) of
Section 8.4, net of (x) the reasonable cash costs of sale, assignment or other
disposition, (y) taxes paid or payable within 22 months of the date of such
Asset Sale as a result thereof (provided, however,  that any such taxes which
are so payable shall be deposited in a Cash Collateral Account acceptable to the
Administrative Agent pending payment) and (z) any amount required to be paid or
prepaid on Indebtedness (other than the Obligations) secured by the assets
subject to such Asset Sale; provided, however, that the evidence of each of (x),
(y) and (z) are provided to the Administrative Agent in form and substance
satisfactory to it; (b) proceeds of insurance (net of (i) reasonable expenses
incurred directly in the collection thereof and (ii) (to the extent permitted
hereby) contractually required payments of Indebtedness (other than the
Obligations) secured by a Lien on the insured property (that is prior to any
Lien granted under the Collateral Documents)) on account of the loss of or
damage to any such assets or property, and payments of compensation for any such
assets or property taken by expropriation, condemnation or eminent domain, to
the extent such proceeds or payments exceed $2,000,000 in the aggregate; and (c)
proceeds received after the Restatement Date by Terra Industries or its
Subsidiaries in cash or Cash Equivalents from (i) any Equity Issuance (other
than any such issuance of common Stock of Terra Industries occurring in the
ordinary course of business to any director, member of the management or
employee of Terra Industries or its Subsidiaries), or (ii) any Debt Issuance
(except for Indebtedness permitted under clauses (c) through (j) of Section
8.1), in each case net of brokers' and advisors' fees and other costs incurred
in connection with such transaction; provided, however, that evidence of such
costs is provided to the Administrative Agent.

          "Non-Material Real Property" means any parcel of real property which
has an open market value (as reasonably determined by the Borrower) of less than
$500,000 or (if leasehold) the lease rental payments in respect thereof are less
than $500,000 per annum.

          "Non-U.S. Lender" means each Lender or Administrative Agent that is
not a United States person as defined in Section 7701(a)(30) of the Code.

          "Note" means a promissory note of the Borrower payable to the order of
any Lender in substantially the form of Exhibit B as amended from time to time.

          "Obligations" means the Advances, the Loans, the Letter of Credit
Obligations, and all other advances, debts, liabilities, obligations, covenants
and duties owing by the Loan Parties to the Administrative Agent, any Lender,
any Issuer, any Affiliate of any of them or any Indemnitee, of every type and
description, present or future, arising under this Agreement or under any other
Loan Document or under or in respect of any credit cards issued for the account
of such Person by the Administrative Agent or any of its Affiliates, by reason
of an extension of credit, opening or amendment of a Letter of Credit or payment
of any draft drawn thereunder, loan, guaranty, indemnification, foreign exchange
transaction, Hedging Contract or otherwise, whether direct or indirect
(including those acquired by assignment), absolute or contingent, due or to
become due, now existing or hereafter arising and however acquired and whether
or not evidenced by any note, guaranty or other instrument or for the payment of
money.  The term "Obligations" includes all letter of credit, cash management
and other fees and all interest,

                                       18
<PAGE>

charges, expenses, fees, attorneys' fees and disbursements and other sums
chargeable to the Loan Parties under this Agreement or any other Loan Document
and all obligations of the Loan Parties to cash collateralize Letter of Credit
Obligations.

          "Obligors" means the Borrower and the Guarantors.

          "PBGC" means the Pension Benefit Guaranty Corporation or any successor
thereto.

          "Permit" means any permit, approval, authorization, license, variance
or permission required from a Governmental Authority under an applicable
Requirement of Law.

          "Permitted Sale Leaseback Transaction" means a sale and leaseback
transaction pursuant to which certain of Terra Capital's US wholly-owned
nitrogen facilities are sold and leased back by Terra Capital or one of its
Subsidiaries, the terms of which (including those relating to covenants,
defaults and intercreditor arrangements) are satisfactory to the Administrative
Agent.

          "Person" means an individual, partnership, corporation (including a
business trust), joint stock company, estate, trust, limited liability company,
unincorporated association, joint venture or other entity, or a Governmental
Authority.

          "Pledge and Security Agreement" means the Pledge and Security
Agreement dated as of the Restatement Date, in substantially the form of Exhibit
E-1, among Terra Industries, Terra Capital, TNLP, each Guarantor that is a
Domestic Subsidiary and the Collateral Agent.

          "Port Neal" means Port Neal Corporation, a Delaware corporation.

          "Post-Default Rate" means a rate per annum equal to 2% plus the
Applicable Margin plus the Base Rate as in effect from time to time.

          "Pre-Closing Material Adverse Change" means a material adverse change
in any of (a) the business, condition (financial or otherwise), operations,
performance, properties or prospects of the Borrower individually, or Terra
Industries and its Subsidiaries, taken as a whole, (b) the legality, validity or
enforceability of any Loan Document, (c) the perfection or priority of the Liens
granted pursuant to the Collateral Documents, (d) the ability of the Borrower to
repay the Obligations or of the Loan Parties to perform their obligations under
the Loan Documents, or (e) the rights and remedies of the Administrative Agent
or the Lenders under the Loan Documents.

          "Pro Forma Balance Sheet" has the meaning specified in Section 4.4(d).

          "Projections" means (i) up until the delivery of any update or
restatement thereof pursuant to Section 6.1(e), those financial projections
contained in Schedule II, covering the Fiscal Years ending in 2000 through 2002,
or (ii) thereafter, the most recent update or restatement of such projections
delivered pursuant to Section 6.1(e).

                                       19
<PAGE>

          "Pro Rata Share" of any amount means, respect to any Lender at any
time, the product of (a) a fraction the numerator of which is the amount of such
Lender's Advances and the denominator of which is the aggregate Advances at such
time, multiplied by (b) such amount.

          "Purchase Event" means the occurrence of any of the following:

          (a)    any Subsidiary of Terra Industries has any outstanding
     Indebtedness owing to Terra Industries or any of its Subsidiaries, other
     than Indebtedness permitted to be outstanding under Section 8.1 (except
     clause (l) thereof); or

          (b)    Liens on or with respect to any property of any Subsidiary of
     Terra Industries have been created in favor of Terra Industries or any of
     its Subsidiaries, other than Liens permitted under Section 8.2 (except
     clause (j) thereof); or

          (c)    any Subsidiary of Terra Industries has made any Investments in
     Terra Industries or any of its Subsidiaries, other than Investments
     permitted under Section 8.3 (except clause (n) thereof); or

          (d)    any Subsidiary of Terra Industries has sold, transferred or
     otherwise disposed of any of its property to Terra Industries or any of its
     Subsidiaries, other than sales, transfers or other dispositions permitted
     under Section 8.4 (except clause (h) thereof); or

          (e)    Terra Industries or any of its Subsidiaries receive, declare,
     order, pay, make or set apart any Restricted Payment other than Restricted
     Payments permitted under Section 8.5 (except clause (e) thereof).

          "Qualifying Lender" means:

          (a)    a bank as defined in (S) 840A for the purposes of (S) 349(3)(a)
     of the UK Income and Corporation Taxes Act 1988 which is within the charge
     to United Kingdom corporation tax in respect of payments of interest
     received by it under this agreement and which is beneficially entitled to
     such interest; or

          (b)    a bank, financial institution or corporation which is resident
     in a country with which the United Kingdom has a double-taxation treaty
     under which that bank, financial institution or corporation is entitled to
     receive principal, interest and fees under this agreement without
     withholding of United Kingdom Income Tax.

          "Quarterly Dates" means March 31, June 30, September 30 and December
31 in each year, the first of which shall be the first such day after the
Restatement Date, provided, however, that, if any such day is not a Business
Day, the relevant Quarterly Date shall be the immediately preceding Business
Day.

          "Real Property" means all of those plots, pieces or parcels of land
now owned, leased or hereafter acquired or leased by any Loan Party or any of
its Subsidiaries (the "Land"), together with the right, title and interest of
such Loan Party or Subsidiary, if any, in and to the streets, the land lying in
the bed of any streets, roads or avenues, opened or proposed, in front of, the
air space and development rights pertaining to the Land and the right to use
such air space and development rights, all rights of way, privileges, liberties,
tenements, hereditaments and

                                       20
<PAGE>

appurtenances belonging or in any way appertaining thereto, all fixtures, all
easements now or hereafter benefiting the Land and all royalties and rights
appertaining to the use and enjoyment of the Land, including all alley, vault,
drainage, mineral, water, oil and gas rights, together with all of the buildings
and other improvements now or hereafter erected on the Land, and any fixtures
appurtenant thereto.

          "Register" has the meaning specified in Section 12.2(c).

          "Release" means, with respect to any Person, any release, spill,
emission, leaking, pumping, injection, deposit, disposal, discharge, dispersal,
leaching or migration, in each case, of any Contaminant into the environment or
into or out of any property owned by such Person, including the movement of
Contaminants through or in the air, soil, surface water, ground water or
property.

          "Remedial Action" means all actions required to (a) clean up, remove,
treat or in any other way address any Release of any Contaminant in the
environment, (b) prevent the Release or threat of Release or minimize the
further Release so that a Contaminant does not migrate or endanger or threaten
to endanger public health or welfare or the environment or (c) perform pre-
remedial studies and investigations and post-remedial monitoring and care.

          "Requirement of Law" means, with respect to any Person, all federal,
state, local, provincial and foreign laws, rules and regulations, orders,
judgments, decrees and other determinations of any Governmental Authority or
arbitrator, applicable to or binding upon such Person or any of its property or
to which such Person or any of its property is subject.

          "Required Lenders" means the Requisite Current Asset Lenders and the
Requisite Fixed Asset Lenders.

          "Requisite Lenders" means those Lenders, Revolving Credit Lenders and
Term Loan Lenders (other than the Guaranteed Fixed Asset Lender) having more
than fifty percent (50%) of the aggregate outstanding amount of (i) the
aggregate outstanding principal amount of the Advances, (ii) the aggregate
Revolving Credit Commitments or, after the Revolving Credit Termination Date,
the aggregate Revolving Credit Outstandings and (iii) the aggregate outstanding
principal amount of the Term Loans (other than the Guaranteed Fixed Asset
Portion). Prior to the Revolving Credit Termination Date, a Non-Funding Lender
shall not be included in the definition of "Requisite Lenders."

          "Requisite Fixed Asset Lenders" has the meaning specified in the
Revolving and Term Credit Agreement.

          "Requisite Current Asset Lenders" means the Lenders and Revolving
Credit Lenders having more than fifty percent (50%) of the aggregate outstanding
amount of (i) the principal outstanding amount of the Advances and (ii) the
Revolving Credit Commitments or, after the Revolving Credit Termination Date,
the Revolving Credit outstandings.  Prior to the Revolving Credit Termination
Date a Non-Funding Lender shall not be included in the calculation of "Requisite
Current Asset Lenders."

          "Responsible Officer" means, with respect to any Person, any of the
principal executive officers, managing members or general partners of such
Person, but in any event, with respect to financial matters, the chief financial
officer, treasurer or controller of such Person.

                                       21
<PAGE>

          "Restatement Date" has the meaning assigned to such term in Section
3.1.

          "Restricted Payment" means (a) any dividend or other distribution,
direct or indirect, on account of any Stock or Stock Equivalents of Terra
Industries or any of its Subsidiaries now or hereafter outstanding, except a
dividend payable solely in Stock or Stock Equivalents or a dividend or
distribution payable solely to the Borrower and/or one or more Subsidiary
Guarantors, (b) any redemption, retirement, sinking fund or similar payment,
purchase or other acquisition for value, direct or indirect, of any Stock or
Stock Equivalents of Terra Industries or any of its Subsidiaries now or
hereafter outstanding other than one payable solely to Terra Industries and/or
one or more Subsidiary Guarantors or any cashless exercise of warrants or
options in respect of the foregoing, and (c) any payment or prepayment of
principal, premium (if any), interest, fees (including fees to obtain any waiver
or consent in connection with any Security) or other charges on, or redemption,
purchase, retirement, defeasance, sinking fund or similar payment with respect
to, any Subordinated Debt, other than any required redemptions, retirement,
purchases or other payments, in each case to the extent permitted to be made by
the terms of such Indebtedness after giving effect to any applicable
subordination provisions.

          "Revolving and Term Administrative Agent" means the Administrative
Agent as defined in the Revolving and Term Credit Agreement.

          "Revolving Credit Borrowers", "Revolving Credit Lender", Revolving
Credit Outstandings" and "Revolving Credit Termination Date" all have the
meanings specified in the Revolving and Term Credit Agreement.

          "Secured Parties" means the Lenders, the Issuers, the Lenders (as
defined in the Revolving and Term Credit Agreement), the Administrative Agent,
the Revolving and Term Administrative Agent, the Collateral Agent, each other
Secured Party (as defined in the Intercreditor Agreement) and any other holder
of any of the Obligations.

          "Security" means any Stock, Stock Equivalent, voting trust
certificate, bond, debenture, note or other evidence of Indebtedness, whether
secured, unsecured, convertible or subordinated, or any certificate of interest,
share or participation in, or any temporary or interim certificate for the
purchase or acquisition of, or any right to subscribe to, purchase or acquire,
any of the foregoing, but shall not include any evidence of the Obligations.

          "Solvent" means, with respect to any Person, that the value of the
assets of such Person (both at fair value and present fair saleable value) is,
on the date of determination, greater than the total amount of liabilities
(including contingent and unliquidated liabilities) of such Person as of such
date and that, as of such date, such Person is able to pay all liabilities of
such Person as such liabilities mature and does not have unreasonably small
capital.  In computing the amount of contingent or unliquidated liabilities at
any time, such liabilities will be computed at the amount which, in light of all
the facts and circumstances existing at such time, represents the amount that
can reasonably be expected to become an actual or matured liability.

          "Sterling" and "(Pounds)" means the lawful money of the United
Kingdom.

          "Stock" means shares of capital stock (whether denominated as common
stock or preferred stock), beneficial, partnership or membership interests,
participations or other equivalents (regardless of how designated) of or in a
corporation, partnership, limited liability company or equivalent entity,
whether voting or non-voting.

                                       22
<PAGE>

          "Stock Equivalents" means all securities convertible into or
exchangeable for Stock and all warrants, options or other rights to purchase or
subscribe for any Stock, whether or not presently convertible, exchangeable or
exercisable.

          "Subordinated Debt" means (a) Indebtedness under the Indentures and
(b) all other Indebtedness of Terra Industries or its Subsidiaries which is
subordinated in right of payment to the prior payment in full of the Advances.

          "Subsidiary" means, with respect to any Person, any corporation,
partnership, limited liability company or other business entity (a) of which an
aggregate of more than 50% of the outstanding Voting Stock is, at the time,
directly or indirectly, owned or controlled by such Person and/or one or more
Subsidiaries of such Person, or (b) the ordinary power to appoint the majority
of the members of the board of directors, managers, trustees or other
controlling Person of which is held by such Person and/or one or more
Subsidiaries of such Person.

          "Subsidiary Guarantor" means each Subsidiary of the Borrower which has
guaranteed all of the Borrower's Obligations.

          "Tax Affiliate" means, with respect to any Person, (a) any Subsidiary
of such Person, and (b) any Affiliate of such Person with which such Person
files or is eligible to file consolidated, combined or unitary Tax Returns.

          "Tax Return" has the meaning specified in Section 4.8(a).

          "Taxes" has the meaning specified in Section 2.9(a).

          "Term Loan" and "Term Loan Lender" have the meanings specified in the
Revolving and Term Credit Agreement.

          "Terra Canada Junior Guaranty" means the Junior Guaranty, dated as of
the Restatement Date, executed by the Borrower in favor of Terra UK Holdings in
respect of  the Terra UK Debt and assigned to the Collateral Agent.

          "Terra Canada Mortgage" means the collateral charge dated December 31,
1997 in favor of the Collateral Agent covering (inter alia) the Borrower's
Courtright, Ontario manufacturing facility.

          "Terra Canada Security Agreement" means the General Security Agreement
dated December 31, 1997 between the Borrower and the Collateral Agent.

          "Terra Canada Security Documents" means, collectively, the Terra
Canada Security Agreement, the Terra Canada Mortgage and each security agreement
or other grant of security now or hereafter made by the Borrower to secure any
of the Obligations hereunder and under the other Loan Documents, and all
recordings, registrations and other filings required by this Agreement or any of
the foregoing to be filed with respect to the Liens created pursuant thereto.

          "Terra Capital" means Terra Capital, Inc., a Delaware corporation.

                                       23
<PAGE>

          "Terra Capital Holdings" means Terra Capital Holdings, Inc., a
Delaware corporation.

          "Terra Oklahoma" means Terra International (Oklahoma) Inc., a Delaware
corporation and a wholly owned Subsidiary of TI.

          "Terra UK" means Terra Nitrogen (U.K.) Limited, a company incorporated
in England and Wales.

          "Terra UK Customer Debt" means Indebtedness for borrowed money of a
customer of Terra UK owing to Capital Bank Plc or another financial institution
in the United Kingdom, provided that:

               (a)    such customer uses the entire principal proceeds of such
          Indebtedness to pay for goods and services purchased from Terra UK;

               (b)    such customer is required to repay such Indebtedness in
          full within 12 months of the date on which such Indebtedness is
          incurred;

               (c)    in the reasonable opinion of Terra UK, such customer is
          creditworthy; and

               (d)    it is a condition of the extension of credit by Capital
          Bank Plc (or such other financial institution) to such customer that
          Terra UK guarantee a portion of such Indebtedness.

          "Terra UK Debt" means Intercompany Indebtedness, in a principal amount
of $175,000,000 (which amount may be reduced by a prepayment of $40,000,000 on
the Restatement Date), owed by Terra UK to Terra UK Holdings.

          "Terra UK Holdings" means Terra (U.K.) Holdings, Inc., a Delaware
corporation and a direct Subsidiary of Beaumont Methanol.

          "Terra UK Share Mortgage" means the share mortgage executed by the
Borrower dated June 30, 1999 in respect of the Stock of Terra UK.

          "TI"  means Terra International, Inc., a Delaware corporation and a
wholly owned Subsidiary of Terra Industries.

          "Title IV Plan" means a pension plan, other than a Multiemployer Plan,
which is covered by Title IV of ERISA to which the Borrower any of its
Subsidiaries or any ERISA Affiliate has any obligation or liability (contingent
or otherwise).

          "TMC" means Terra Methanol Corporation, a Delaware corporation.

          "TNC" means Terra Nitrogen Corporation, a Delaware corporation and a
wholly owned Subsidiary of Terra Capital.

          "TNCLP" means Terra Nitrogen Company, L.P., a Delaware limited
partnership and a Subsidiary of Terra Capital.

                                       24
<PAGE>

          "TNCLP Minority Interest Payments" means dividends and distributions
which are legally required to be paid to holders (other than Terra Industries
and its Subsidiaries) of limited partnership interests in TNCLP.

          "TNLP" means Terra Nitrogen Limited Partnership, a Delaware Limited
Partnership.

          "TNLP Debt" means Intercompany Indebtedness owing from time to time by
TNLP to Terra Capital.

          "Total Assets" of any Person means, at any date, the total assets of
such Person and its Subsidiaries at such date determined on a consolidated basis
in conformity with GAAP minus (a) any minority interest in non-wholly-owned
Subsidiaries that would be reflected on a consolidated balance sheet of such
person and its Subsidiaries at such date prepared in conformity with GAAP and
(b) any Securities issued by such Person held as treasury securities.

          "Type" refers to the distinction between Advances bearing interest at
the Base Rate and Advances bearing interest at the Eurodollar Rate.

          "Unfunded Pension Liability" means, with respect to the Borrower at
any time, the sum of (a) the amount, if any, by which the present value of all
accrued benefits under each Title IV Plan (other than any Title IV Plan subject
to Section 4063 of ERISA) exceeds the fair market value of all assets of such
Title IV Plan allocable to such benefits in accordance with Title IV of ERISA,
as determined as of the most recent valuation date for such Title IV Plan using
the actuarial assumptions in effect under such Title IV Plan, and (b) the
aggregate amount of withdrawal liability that could be assessed under Section
4063 with respect to each Title IV Plan subject to such Section, separately
calculated for each such Title IV Plan as of its most recent valuation date and
(c) for a period of five years following a transaction reasonably likely to be
covered by Section 4069 of ERISA, the liabilities (whether or not accrued) that
could be avoided by the Borrower, any of its Subsidiaries or any ERISA Affiliate
as a result of such transaction.

          "United Kingdom" and "UK" each means the territory known as the United
Kingdoms of England, Scotland, Wales and Northern Ireland.

          "US Concentration Account" means the concentration account opened with
Citibank in New York, New York set forth on Schedule 7.12

          "Voting Stock" means Stock of any Person having ordinary power to vote
in the election of members of the board of directors, managers, trustees or
other controlling Persons, of such Person (irrespective of whether, at the time,
Stock of any other class or classes of such entity shall have or might have
voting power by reason of the happening of any contingency).

          "Withdrawal Liability" means, with respect to the Borrower at any
time, the aggregate liability incurred (whether or not assessed) with respect to
all Multiemployer Plans pursuant to Section 4201 of ERISA or for increases in
contributions required to be made pursuant to Section 4243 of ERISA.

          "Year 2000 Compliant" means the ability of hardware, firmware or
software systems associated with information processing and delivery, operations
or services, operated by, provided to or otherwise necessary to the business or
operations of Terra Industries or any of its

                                       25
<PAGE>

Subsidiaries to recognize and properly perform date-sensitive functions
involving certain dates prior to, and at any date after, December 31, 1999.

          Section 1.2.    Computation of Time Periods.  In this Agreement, in
                          ---------------------------
the computation of periods of time from a specified date to a later specified
date, the word "from" means "from and including" and the words "to" and "until"
each mean "to but excluding" and the word "through" means "to and including."

          Section 1.3.    Accounting Terms and Principles.
                          -------------------------------
          (a)    Except as set forth below, all accounting terms not
     specifically defined herein shall be construed in conformity with GAAP and
     all accounting determinations required to be made pursuant hereto shall,
     unless expressly otherwise provided herein, be made in conformity with
     GAAP.

          (b)    If any change in the accounting principles used in the
     preparation of the most recent Financial Statements referred to in Section
     6.1 is hereafter required or permitted by the rules, regulations,
     pronouncements and opinions of the Financial Accounting Standards Board or
     the American Institute of Certified Public Accountants (or any successors
     thereto) and such change is adopted by the Borrower with the agreement of
     its independent public accountants and results in a change in the results
     of any of the calculations required by Article V or Article VIII which
     would not have occurred had such accounting change not occurred, the
     parties hereto agree to enter into negotiations in order to amend such
     provisions so as to equitably reflect such change with the desired result
     that the criteria for evaluating compliance with such covenants by the
     Borrower shall be the same after such change as if such change had not been
     made; provided, however, that no change in GAAP that would affect a
     calculation that measures compliance with any covenant contained in Article
     V or Article VIII shall be given effect until such provisions are amended
     to reflect such changes in GAAP.

          Section 1.4.    Certain Terms.
                          -------------

          (a)    The words "herein," "hereof" and "hereunder" and similar words
     refer to this Agreement as a whole, and not to any particular Article,
     Section, subsection or clause in, this Agreement.

          (b)    References in this Agreement to an Exhibit, Schedule, Article,
     Section, subsection or clause refer to the appropriate Exhibit or Schedule
     to, or Article, Section, subsection or clause in this Agreement.

          (c)    Each agreement defined in this Article I shall include all
     appendices, exhibits and schedules thereto. Unless the prior written
     consent of the Requisite Lenders (or such other combination of Lenders as
     may be required hereunder) is required hereunder for an amendment,
     restatement, supplement or other modification to any such agreement and
     such consent is not obtained, references in this Agreement to such
     agreement shall be to such agreement as so amended, restated, supplemented
     or modified.

          (d)    References in this Agreement to any statute shall be to such
     statute as amended or modified and in effect at the time any such reference
     is operative.

                                       26
<PAGE>

          (e)    The term "including" when used in any Loan Document means
     "including without limitation" except when used in the computation of time
     periods.

          (f)    The terms "Lender," "Administrative Agent" and "Collateral
     Agent" include their respective successors.

          (g)    Upon the appointment of any successor Administrative Agent
     pursuant to Section 11.6, references to Citibank in Section 11.3 and to
     Citibank in the definitions of Base Rate and Eurodollar Rate shall be
     deemed to refer to the financial institution then acting as the
     Administrative Agent or one of its Affiliates if it so designates.


                                  ARTICLE II

                      Amounts and  Terms of The Advances

          Section 2.1.    The Advances.
                          ------------

          (a)    Outstanding Advances.  The parties hereto agree that, on and
     after the Restatement Date, all Existing Advances shall be advances of the
     Lenders (the "Advances") outstanding hereunder, it being the intention of
     the parties hereto that the Existing Advances shall continue and remain
     outstanding and not be repaid on the Restatement Date. The outstanding
     balance of the Advances on the date hereof is $109,375,000.

          (b)    No Responsibility to Third Parties. Neither the Administrative
     Agent nor any Lender shall have any responsibility as to the application or
     use of any of the proceeds of any Advance.

          Section 2.2.    Repayment.  The Borrower hereby promises to pay to the
                          ---------
Administrative Agent for the account of each Lender the full outstanding
principal amount of such Lender's Advances on the Maturity Date.  All repayments
of principal under this Section 2.2 shall be made together with interest accrued
to the date of such repayment on the principal amount repaid.

          Section 2.3.    Termination of the Commitments.  The "Commitments"
                          ------------------------------
under the Existing Credit Agreement were automatically and permanently reduced
to zero on December 31, 1997. Such "Commitments" may not be reinstated.

          Section 2.4.    Optional Prepayments.
                          --------------------

          The Borrower may, upon at least four Business Days' notice (in the
case of prepayment of Eurodollar Rate Advances) or upon at least one Business
Day's notice given (in the case of prepayments of Base Rate Advances) to the
Administrative Agent (which notice shall state the proposed date and aggregate
principal amount of the prepayment), and, if such notice is given, the Borrower
shall, prepay the outstanding principal amount of the Advances in the aggregate
amount and on the date specified in such notice, together with accrued interest
to the date of such prepayment on the principal amount prepaid; provided,
however, that (i) each partial prepayment shall be in an aggregate principal
amount of $5,000,000 or an integral multiple of $1,000,000 in excess thereof,
(ii) any such prepayment of a Eurodollar Rate Advance other than on the last day
of the Interest Period therefor shall be accompanied by, and subject to, the
payment of any amount payable under Section 2.7(e) in respect of such prepayment
and (iii) each

                                       27
<PAGE>

such notice shall be made on the relevant day not later than, in the case of
prepayments of Eurodollar Rate Advances, 10:00 A.M. (New York City time) and, in
the case of prepayments of Base Rate Advances, 12:00 Noon (New York City time).
Optional prepayments pursuant to this paragraph (a) shall be applied to the then
outstanding principal amount of the Advances for the account of the Lenders
according to their respective Pro Rata Shares of the principal amount of the
Advances then outstanding. Advances once prepaid may not be reborrowed.

          Section 2.5.    Interest.
                          --------

          (a)    Ordinary Interest.  The Borrower shall pay interest on the
unpaid principal amount of each Advance owing to each Lender from the date of
such Advance until such principal amount shall be paid in full at the following
rates per annum:

                 (i)    Base Rate Advances.  While such Advance is a Base Rate
     Advance, a rate per annum equal at all times to the sum of (A) the Base
     Rate in effect from time to time plus (B) the Applicable Margin in effect
     from time to time, payable in arrears on the first day of each calendar
     month, commencing on the first such day following the making of such Base
     Rate Advance and, if not previously paid in full, at Maturity (by
     acceleration or otherwise).

                 (ii)   Eurodollar Rate Advances.  While such Advance is a
     Eurodollar Rate Advance, a rate per annum equal at all times during each
     Interest Period for such Advance to the sum of (A) the Eurodollar Rate for
     such Interest Period for such Advance plus (B) the Applicable Margin in
     effect from time to time, payable in arrears on the last day of such
     Interest Period and, if such Interest Period has a duration of more than
     three months, on each three-month anniversary of the first day of such
     Interest Period occurring during such Interest Period.

          (b)    Post-Default Interest.  If (i) any Obligor shall fail to pay
when due (by acceleration or otherwise) any amount payable under any Loan
Document after any applicable grace period provided in Section 9.1(a) or (ii)
(A) an Event of Default shall have occurred and be continuing during any period
and (B) the Administrative Agent or the Required Lenders, through the
Administrative Agent, shall have notified the Borrower thereof, the Borrower
shall, notwithstanding anything else in this Agreement to the contrary, pay to
the Administrative Agent for account of each Lender interest, during such
period, at the applicable Post-Default Rate on the outstanding principal of each
Advance, and on any other amount whatsoever then due and payable by the Borrower
hereunder or under the Notes held by such Lender to or for account of such
Lender, such interest to be payable from time to time on demand.

          Section 2.6.    Conversion and Continuation of Advances.
                          ---------------------------------------

          (a)    Optional Conversion.  The Borrower may on any Business Day,
upon notice given to the Administrative Agent not later than 10:00 A.M. (New
York City time) on the second Business Day prior to the date of the proposed
Conversion and subject to the provisions of Sections 2.7 and 2.8, Convert all or
any portion of the Advances of one Type (and, in the case of Eurodollar Rate
Advances, having the same Interest Period); provided, however, that any
Conversion of Eurodollar Rate Advances into Base Rate Advances shall be made
only on the last day of an Interest Period for such Eurodollar Rate Advances,
any Conversion of Base Rate Advances into Eurodollar Rate Advances shall be in
an amount not less than $5,000,000 or an integral multiple of $1,000,000 in
excess thereof and no Conversion of any Advances shall result

                                       28
<PAGE>

in more than three (3) separate Interest Periods being outstanding. Each such
Notice of Conversion shall, within the restrictions specified above, specify (i)
the date of such Conversion, (ii) the aggregate amount and Type of the Advances
(and, in the case of Eurodollar Rate Advances, the Interest Period therefor) to
be Converted and (iii) if such Conversion is into Eurodollar Rate Advances, the
duration of the initial Interest Period for such Advances. Each notice of
Conversion shall be irrevocable and binding on the Borrower.

          (b)    Certain Mandatory Conversions.

                 (i)    On the date on which the aggregate unpaid principal
     amount of Eurodollar Rate Advances having the same Interest Period shall be
     reduced, by payment or prepayment or otherwise, to less than $5,000,000
     such Advances shall automatically Convert into Base Rate Advances.

                 (ii)   If the Borrower shall fail to select the duration of any
     Interest Period for any outstanding Eurodollar Rate Advances in accordance
     with the provisions contained in the definition of "Interest Period" in
     Section 1.1 and in clause (a) or (c) of this Section 2.6, such Eurodollar
     Rate Advance will automatically, on the last day of the then existing
     Interest Period therefor, Convert into a Base Rate Advance.

                 (iii)  Upon the occurrence and during the continuance of any
Event of Default, (A) each Eurodollar Rate Advance will automatically, on the
last day of the then existing Interest Period therefor, Convert into a Base Rate
Advance and (B) the obligation of the Lenders to make, or to Convert Advances
into, or to Continue, Eurodollar Rate Advances shall be suspended.

          (c)    Continuations.  The Borrower may, on any Business Day, upon
notice given to the Administrative Agent not later than 10:00 A.M. (New York
City time) on the second Business Day prior to the date of the proposed
Continuation and subject to the provisions of Section 2.7, Continue all or any
portion of the outstanding Eurodollar Rate Advances having the same Interest
Period as such Eurodollar Rate Advances; provided, however, that any such
Continuation shall be made only on the last day of an Interest Period for such
Eurodollar Rate Advances, any Continuation of Eurodollar Rate Advances shall be
in an amount not less than $5,000,000 or an integral multiple of $1,000,000 in
excess thereof and no Continuation of any Advances shall result in more than
three (3) separate Interest Periods being outstanding. Each such notice of
Continuation shall, within the restrictions specified above, specify (i) the
date of such Continuation, (ii) the aggregate amount of, and the Interest Period
for, the Advances being Continued and (iii) the duration of the initial Interest
Period for the Eurodollar Rate Advances subject to such Continuation. Each
notice of Continuation shall be irrevocable and binding on the Borrower.

          Section 2.7.    Increased Costs, Illegality, Etc.
                          ---------------------------------

          (a)    Determination of Interest Rate.  The Eurodollar Rate for each
Interest Period for Eurodollar Rate Advances shall be determined by the
Administrative Agent pursuant to the procedures set forth in the definition of
"Eurodollar Rate." The Administrative Agent's determination shall be presumed to
be correct, absent manifest error, and shall be binding on the Borrower.

                                       29
<PAGE>

          (b)    Interest Rate Unascertainable, Inadequate or Unfair.  In the
event that: (i) the Administrative Agent reasonably determines that adequate and
fair means do not exist for ascertaining the applicable interest rates by
reference to which the Eurodollar Rate then being determined is to be fixed; or
(ii) the Requisite Lenders notify the Administrative Agent that the Eurodollar
Rate for any Interest Period will not adequately reflect the cost to the Lenders
of making or maintaining such Advances for such Interest Period, the
Administrative Agent shall forthwith so notify the Borrower and the Lenders,
whereupon each Eurodollar Rate Advance will automatically, on the last day of
the current Interest Period for such Advance, convert into a Base Rate Advance
and the obligations of the Lenders to make Eurodollar Rate Advances or to
convert Base Rate Advances into Eurodollar Rate Advances shall be suspended
until the Administrative Agent shall notify the Borrower that the Requisite
Lenders have determined that the circumstances causing such suspension no longer
exist.

          (c)    Increased Costs.  If at any time any Lender shall reasonably
determine that the introduction of or any change (where such introduction or
change occurs after the date of this Agreement) in or in the interpretation of
any law, treaty or governmental rule, regulation or order (other than any change
by way of imposition or increase of reserve requirements included in determining
the Eurodollar Rate Reserve Percentage and other than any change in the rate of
tax on, or determined by reference to, the net income or profits of such Lender
(including franchise taxes) or capital of such Lender) or the compliance by such
Lender with any guideline, request or directive where such guideline, request or
directive is issued after the date of this Agreement) from any central bank or
other Governmental Authority (whether or not having the force of law but in
relation to which such Lender customarily complies), there shall be any increase
in the cost to such Lender of agreeing to make or making, funding or maintaining
any Eurodollar Rate Advances made to the Borrower, then the Borrower shall from
time to time, upon demand by such Lender (with a copy of such demand to the
Administrative Agent), pay to the Administrative Agent for the account of such
Lender additional amounts sufficient to compensate such Lender for such
increased cost. A certificate as to the amount of such increased cost, submitted
to the Borrower and the Administrative Agent by such Lender, shall be conclusive
and binding for all purposes, absent manifest error.

          (d)    Illegality.  Notwithstanding any other provision of this
Agreement, if any Lender determines that the introduction of or any change in or
in the interpretation of any law, treaty or governmental rule, regulation or
order after the date of this Agreement shall make it unlawful, or any central
bank or other Governmental Authority shall assert that it is unlawful, for any
Lender or its Eurodollar Lending Office to make Eurodollar Rate Advances or to
continue to fund or maintain Eurodollar Rate Advances, then, on notice thereof
and demand therefor by such Lender to the Borrower through the Administrative
Agent, (i) the obligation of such Lender to make or to continue Eurodollar Rate
Advances and to convert Base Rate Advances into Eurodollar Rate Advances shall
be suspended and (ii) if the affected Eurodollar Rate Advances shall immediately
(or, if lawful to do so, on the last day of the current Interest Period relating
thereto) be Converted into a Base Rate Advance. If at any time after a Lender
gives notice under this Section 2.7(d) such Lender determines that it may
lawfully make Eurodollar Rate Advances, such Lender shall promptly give notice
of that determination to the Borrower and the Administrative Agent, and the
Administrative Agent shall promptly transmit the notice to each other Lender.
The Borrower's right to request, and such Lender's obligation, if any, to make
Eurodollar Rate Advances shall thereupon be restored.

                                       30
<PAGE>

          (e)    Breakage Costs.  In addition to all amounts required to be paid
by the Borrower pursuant to Section 2.2, or to be paid (in respect of any
optional prepayment) pursuant to Section 2.4, the Borrower shall compensate each
Lender, upon demand, for all losses, expenses and liabilities (including any
loss or expense incurred by reason of the liquidation or reemployment of
deposits or other funds acquired by such Lender to fund or maintain such
Lender's Eurodollar Rate Advances to the Borrower but excluding any loss of the
Applicable Margin on the relevant Advances) which that Lender may sustain (i) if
for any reason (other than under Section 2.7(b)) a Conversion into, or
Continuation of, Eurodollar Rate Advances does not occur on a date specified
therefor in a notice of Conversion or Continuation given by such Borrower or in
a telephonic request by it for borrowing or conversion or continuation or a
successive Interest Period does not commence after notice therefor is given
pursuant to Section 2.6, (ii) if for any reason any Eurodollar Rate Advance is
prepaid on a date which is not the last day of the applicable Interest Period,
(iii) as a consequence of a required conversion of a Eurodollar Rate Advance to
a Base Rate Advance as a result of any of the events indicated in Section 2.7(b)
or (d), or (iv) as a consequence of any failure by the Borrower to repay
Eurodollar Rate Advances when required by the terms hereof. The Lender making
demand for such compensation shall deliver to the Borrower concurrently with
such demand a written statement as to such losses, expenses and liabilities, and
this statement shall be conclusive as to the amount of compensation due to that
Lender, absent manifest error.

          (f)    Capital Adequacy.  If at any time any Lender reasonably
determines that (a) the adoption of or any change in or in the interpretation of
any law, treaty or governmental rule, regulation or order after the date of this
Agreement regarding capital adequacy, (b) compliance with any such law, treaty,
rule, regulation, or order, or (c) compliance with any guideline or request or
directive issued after the date hereof from any central bank or other
Governmental Authority (whether or not having the force of law) shall have the
effect of reducing the rate of return on such Lender's (or any corporation
controlling such Lender's) capital as a consequence of its obligations hereunder
to a level below that which such Lender or such corporation could have achieved
but for such adoption, change, compliance or interpretation, then, upon demand
from time to time by such Lender (with a copy of such demand to the
Administrative Agent), the Borrower shall pay to the Administrative Agent for
the account of such Lender, from time to time as specified by such Lender,
additional amounts sufficient to compensate such Lender for such reduction. A
certificate as to such amounts submitted to the Borrower and the Administrative
Agent by such Lender shall be conclusive and binding for all purposes absent
manifest error.

          (g)    Excluded Period.  No Lender shall be entitled to make a claim
under Clauses 2.7(c) or (f) or Section 2.9 unless it has notified the
Administrative Agent of its intention to make such claim within 180 days of such
Lender becoming aware of the circumstances giving rise to such claim.

          Section 2.8.    Payments and Computations.
                          -------------------------

          (a)    The Borrower shall make each payment hereunder and under the
Notes not later than 12:00 Noon (New York City time) on the day when due in
Dollars to the Administrative Agent at the Administrative Agent's Account in
same day funds and, except as expressly set forth herein, without deduction,
set-off or counterclaim. The Administrative Agent will promptly thereafter cause
to be distributed like funds relating to the payment of principal or interest
hereunder ratably (other than amounts payable pursuant to Section 2.7(c),
2.7(e), 2.7(f) or 2.9) to the Lenders for the account of their Applicable
Lending Offices, and like funds relating to

                                       31
<PAGE>

the payment of any other amount payable to any Lender to such Lender for the
account of its Applicable Lending Office, in each case to be applied in
accordance with the terms of this Agreement. Upon its acceptance of an
Assignment and Acceptance and recording of the information contained therein in
the Register pursuant to Section 12.2, from and after the effective date of such
Assignment and Acceptance, the Administrative Agent shall make all payments
hereunder and under the Notes in respect of the interest assigned thereby to the
Lender assignee thereunder, and the parties to such Assignment and Acceptance
shall make all appropriate adjustments in such payments for periods prior to
such effective date directly between themselves.

          (b)    If the Administrative Agent receives funds for application to
the Obligations under the Loan Documents under circumstances for which the Loan
Documents do not specify the Advances to which, or the manner in which, such
funds are to be applied, and the Borrower has not otherwise directed how such
funds are to be applied (which direction is consistent with the terms of the
Loan Documents), the Administrative Agent may, but shall not be obligated to,
elect to distribute such funds to each Lender ratably in accordance with such
Lender's proportionate share of the principal amount of all outstanding
Advances, in repayment or prepayment of such of the outstanding Advances or
other Obligations owed to such Lender, and for application to such principal
installments, as the Administrative Agent shall direct.

          (c)    The Borrower hereby authorizes each Lender, if and to the
extent payment owed to such Lender is not made when due hereunder or under any
Note held by such Lender, to charge from time to time against any or all of the
Borrower's accounts with such Lender any amount so due (with notice to the
Administrative Agent and the Borrower promptly following such charge).

          (d)    All computations of interest shall be made by the
Administrative Agent on the basis of a year of 360 days, in each case for the
actual number of days (including the first day but excluding the last day)
occurring in the period for which such interest, fees or commissions are
payable. Each determination by the Administrative Agent of an interest rate
hereunder made in accordance with the provisions of this Agreement shall be
conclusive and binding for all purposes, absent manifest error. For purposes of
the Interest Act (Canada) and disclosure thereunder, whenever interest or any
fee to be paid hereunder or in connection herewith is to be calculated on the
basis of any period of time that is less than a calendar year, the yearly rate
of interest to which the rate determined pursuant to such calculation is
equivalent is the rate so determined multiplied by the actual number of days in
the calendar year in which the same is to be ascertained and divided by the
number of days in such period of time. The rates of interest under this
Agreement are nominal rates, and not effective rates or yields. The principle of
deemed reinvestment of interest does not apply to any interest calculation under
this Agreement.

          (e)    Whenever any payment hereunder or under the Notes shall be
stated to be due on a day other than a Business Day, such payment shall be made
on the next succeeding Business Day, and such extension of time shall in such
case be included in the computation of payment of interest; provided, however,
that, if such extension would cause payment of interest on or principal of
Eurodollar Rate Advances to be made in the next following calendar month, such
payment shall be made on the immediately preceding Business Day.

          (f)    Unless the Administrative Agent shall have received notice from
the Borrower prior to the date on which any payment is due to any Lender
hereunder that the Borrower will not make such payment in full, the
Administrative Agent may assume that the

                                       32
<PAGE>

Borrower has made such payment in full to the Administrative Agent on such date
and the Administrative Agent may, in reliance upon such assumption, cause to be
distributed to each such Lender on such due date an amount equal to the amount
then due such Lender. If and to the extent the Borrower shall not have so made
such payment in full to the Administrative Agent, each such Lender shall repay
to the Administrative Agent forthwith on demand such amount distributed to such
Lender together with interest thereon at the Federal Funds Rate for the first
Business Day, and, thereafter, at the rate applicable to Base Rate Advances, for
each day from the date such amount is distributed to such Lender until the date
such Lender repays such amount to the Administrative Agent.

          (g)    Subject to the provisions of clause (h) of this Section 2.8 and
the provisions of the Intercreditor Agreement, all payments and any other
amounts received by the Administrative Agent from or for the benefit of the
Borrower shall be applied first, to pay principal of and interest on any portion
of the Advances which the Administrative Agent may have advanced to the Borrower
pursuant to the express provisions of this Agreement on behalf of any Lender,
for which the Administrative Agent has not then been reimbursed by such Lender
or the Borrower; second, to pay all other Obligations owing by the Borrower then
due and payable; and third, as the Borrower so designates. All payments of fees
and all other payments in respect of any other Obligation shall be allocated
among such of the Lenders as are entitled thereto, and, if to the Lenders, in
proportion to their respective Pro Rata Shares.

          (h)    After the occurrence and during the continuance of an Event of
Default, each Obligor hereby irrevocably waives the right to direct the
application of any payments and all payments in respect of the Obligations owing
by such Obligor and any proceeds of Collateral of such Obligor shall be applied
in accordance with the Intercreditor Agreement.

          Section 2.9.    Taxes.
                          -----

          (a)    Any and all payments by the Obligors under each Loan Document
shall be made free and clear of and without deduction for any and all present or
future taxes, levies, imposts, deductions, charges or withholdings, and all
liabilities with respect thereto (including any of the foregoing which may be
imposed in Canada or any political subdivision or taxing authority thereof or
therein, or any federal or other association of or with which Canada may be a
member or associated and specifically including any withholding made pursuant to
Part XIII of the Income Tax Act (Canada) in respect of any interest payment
hereunder) unless the relevant Obligor is required to do so by law or the
interpretation thereof by the relevant taxing authority; provided, however, that
the following will be excluded taxes (i) in the case of each Lender and the
Administrative Agent (A) taxes imposed on or measured by its net income, and
franchise taxes imposed on it, by the jurisdiction (or any political subdivision
thereof) under the laws of which such Lender or the Administrative Agent (as the
case may be) is organized or in which it maintains any office or operations and
(B) any United States withholding taxes payable with respect to payments under
the Loan Documents under laws (including any statute, treaty or regulation) in
effect on the Restatement Date (or, in the case of an Eligible Assignee, the
date of the Assignment and Acceptance) applicable to such Lender or the
Administrative Agent, as the case may be, but not excluding any United States
withholding payable as a result of any change in such laws occurring after the
Restatement Date (or the date of such Assignment and Acceptance) (but excluding
taxes set forth in clause (A) above) and (ii) in the case of each Lender, taxes
imposed on or measured by its net income, and franchise taxes imposed on it, by
the jurisdiction in which such Lender's Applicable Lending Office is located;
and (iii) in the case of each Lender, taxes arising by reason of the Lender
being a person with whom the Borrower is not dealing at

                                       33
<PAGE>

arm's length for the purposes of the Income Tax Act (Canada) (all such non-
excluded taxes, levies, imposts, deductions, charges, withholdings and
liabilities being hereinafter referred to as "Taxes"). If any Taxes shall be
required by law to be deducted from or in respect of any sum payable by any
Obligor under any Loan Document to any Lender or the Administrative Agent (i)
the sum payable shall be increased as may be necessary so that after making all
required deductions (including deductions applicable to additional sums payable
under this Section 2.9) such Lender or the Administrative Agent (as the case may
be) receives an amount equal to the sum it would have received had no such
deductions been made, (ii) such Obligor shall make such deductions, (iii) such
Obligor shall pay the full amount deducted to the relevant taxing authority or
other authority in accordance with applicable law, and (iv) such Obligor shall
deliver to the Administrative Agent evidence of such payment.

          (b)    In addition, each Obligor agrees to pay any present or future
stamp or documentary taxes or any other excise or property taxes, charges or
similar levies of the United States or any political subdivision thereof or any
applicable foreign jurisdiction, and all liabilities with respect thereto, which
arise from any payment made by such Obligor or any of its Subsidiaries under any
Loan Document or from the execution, delivery or registration of, or otherwise
with respect to, any Loan Document (collectively, "Other Taxes").

          (c)    Each Obligor will indemnify each Lender and the Administrative
Agent for the full amount of Taxes or Other Taxes (including any Taxes or Other
Taxes imposed by any jurisdiction on amounts payable under this Section 2.9)
paid by such Lender or the Administrative Agent (as the case may be) and any
liability (including for penalties, interest and expenses) arising therefrom or
with respect thereto, whether or not such Taxes or Other Taxes were correctly or
legally asserted. This indemnification shall be made within 30 days from the
date such Lender or the Administrative Agent (as the case may be) makes written
demand therefor.

          (d)    Within 30 days after the date of any payment of Taxes or Other
Taxes, the applicable Obligor will furnish to the Administrative Agent, at its
address referred to in Section 11.8, the original or a certified copy of a
receipt evidencing payment thereof.

          (e)    Without prejudice to the survival of any other agreement of the
Obligors hereunder, the agreements and obligations of the Obligors contained in
this Section 2.9 shall survive the payment in full of the Obligations.

          (f)    Any Lender claiming any additional amounts payable pursuant to
this Section 2.9 shall use its reasonable efforts (consistent with its internal
policy and legal and regulatory restrictions) to change the jurisdiction of its
Applicable Lending Office if the making of such a change would avoid the need
for, or reduce the amount of, any such additional amounts which would be payable
or may thereafter accrue and would not, in the sole determination of such
Lender, be otherwise disadvantageous to such Lender. If any Lender is not, with
reasonable efforts, able to change the jurisdiction of its Applicable Lending
Office in accordance with this Section 2.9(g), then such Lender shall use its
reasonable efforts to complete such tax forms and make such filings as would
avoid the need for, or reduce the amount of, any such additional amounts which
would be payable or may thereafter accrue; provided, however, that completion of
such forms and making of such filings would not in the sole discretion of such
Lender be disadvantageous to it.

          (g)    On the date of the Assignment and Acceptance pursuant to which
any Non-U.S. Lender becomes a Lender after the RestatementDate, if requested by
the Guarantors or

                                       34
<PAGE>

the Administrative Agent, each Non-U.S. Lender that is entitled at such time to
an exemption from United States withholding tax shall provide the Administrative
Agent and the Guarantors with two complete copies of IRS From W-8 (Ben or ECI as
appropriate including any required certifications) or other applicable form,
certificate or document prescribed by the IRS certifying as to such Non-U.S.
Lender's entitlement to such exemption from United States withholding tax with
respect to all payments made to such Non-U.S. Lender under the Loan Documents
with respect to payments to be made by the Guarantors (other than Terra UK).
Unless the Guarantors and the Administrative Agent have received forms or other
documents satisfactory to them indicating that payments under any Loan Documents
to or for a Non-U.S. Lender are subject to United States withholding tax, the
Guarantor or the Administrative Agent shall withhold taxes from such payments at
the applicable statutory rate.

          (h)    (i) As at the date of this Agreement, the Administrative Agent
and each Lender represents and warrants to the Loan Parties that (to the extent
that any payments are to be made to it hereunder by Terra UK) it is a Qualifying
Lender, (ii) if a Lender ceases to be a Qualifying Lender (except as a result of
the introduction of, change in, or change in the interpretation, administration
or application of, any law or regulation or any practice or concession of the
United Kingdom Inland Revenue occurring after the date of this Agreement) or any
transfer, sale , negotiation or assignment is made pursuant to Section 12.2 to a
non-Qualifying Lender, then the Loan Parties shall not be liable to pay any
amount under Section 2.9(a) in excess of the amount which it would have been
obliged to pay if that Lender had remained a Qualifying Lender. Each Lender
shall notify the Administrative Agent who in turn shall notify the Borrower as
soon as reasonably practicable after it becomes aware that it has ceased to be a
Qualifying Lender.

          (i)    The Borrower represents and warrants that, as of the date
hereof, to the best of its knowledge after due inquiry, (i) neither this
Agreement nor the execution or delivery by the Borrower of this Agreement is
subject to any Taxes, and (ii) no payment to be made by the Borrower hereunder
or under any Note is subject to any Taxes.

          Section 2.10.    Sharing of Payments, Etc.  Subject to the provisions
                           ------------------------
of the Intercreditor Agreement, if any Lender shall obtain any payment (whether
voluntary, involuntary, through the exercise of any right of set-off, or
otherwise) on account of the Advances owing to it (other than pursuant to
Section 2.7(c), 2.7(e), 2.7(f) or 2.9) in excess of its ratable share of
payments on account of the Advances obtained by all the Lenders, such Lender
shall forthwith purchase from the other Lenders such participations in the
Advances owing to them as shall be necessary to cause such purchasing Lender to
share the excess payment ratably with each of them; provided, however, that if
all or any portion of such excess payment is thereafter recovered from such
purchasing Lender, such purchase from each Lender shall be rescinded and such
Lender shall repay to the purchasing Lender the purchase price to the extent of
such recovery together with an amount equal to such Lender's ratable share
(according to the proportion of (i) the amount of such Lender's required
repayment to (ii) the total amount so recovered from the purchasing Lender) of
any interest or other amount paid or payable by the purchasing Lender in respect
of the total amount so recovered. The Borrower agrees that any Lender so
purchasing a participation from another Lender pursuant to this Section 2.10
may, to the fullest extent permitted by law, exercise all its rights of payment
(including the right of set-off) with respect to such participation as fully as
if such Lender were the direct creditor of the Borrower in the amount of such
participation.

                                       35
<PAGE>

          Section 2.11.  Criminal Rate of Interest. Notwithstanding any other
                         -------------------------
provisions of this Agreement, in no event shall the aggregate "interest" (as
defined in Section 347 ("Section 347") of the Criminal Code, Revised Statutes of
Canada, 1985, C-46, as the same shall be amended, replaced or re-enacted from
time to time) payable to the Lenders under this Agreement exceed the effective
annual rate of interest on the "credit advances" (as defined in Section 347)
hereunder lawfully permitted under Section 347 and, if any payment, collection
or demand pursuant to this Agreement in respect of "interest" (as defined in
Section 347) is determined to be contrary to the provisions of Section 347, such
payment, collection or demand shall be deemed to have been made by mutual
mistake of the Lenders and the Borrower and the amount of such payment or
collection shall be refunded by the Lenders to the Borrower. For the purposes of
this Agreement, the effective annual rate of interest shall be determined in
accordance with generally accepted actuarial practices and principles over the
term of the Advances on the basis of annual compounding for the lawfully
permitted rate of interest and, in the event of dispute, a certificate of a
Fellow of the Canadian Institute of Actuaries appointed by the Administrative
Agent for the account of the Borrower will be conclusive for the purpose of such
determination in the absence of evidence to the contrary.

          Section 2.12.  Replacement of Lenders. In the event that (a) (i) any
                         ----------------------
Lender makes a claim under Section 2.7 (c) or (f), or (ii) it becomes illegal
for any Lender to continue to fund or make or to Convert Base Rate Advances
into, or to Continue, any Eurodollar Rate Advances and such Lender notifies the
Borrowers pursuant to Section 2.7(d), or (iii) any Obligor is required to make
any payment pursuant to Section 2.9 that is attributable to any Lender, (b) in
the case of clause (a)(i) above, as a consequence of increased costs in respect
of which such claim is made, the effective rate of interest payable to such
Lender under this Agreement with respect to its Advances materially exceeds the
effective average annual rate of interest payable to the Requisite Lenders under
this Agreement and (c) Lenders holding at least 75% of the Advances are not
subject to such increased costs or illegality, payment or proceedings (any such
Lender, an "Affected Lender"), the Borrower may substitute another financial
institution for such Affected Lender hereunder, upon reasonable prior written
notice (which written notice must be given within 90 days following the
occurrence of any of the events described in clauses (a)(i), (ii), (iii) or
(iv)) by the Borrower to the Administrative Agent and the Affected Lender that
the Borrower intends to make such substitution, which substitute financial
institution must be an Eligible Assignee and, if not a Lender, reasonably
acceptable to the Administrative Agent; provided, however, that if more than one
Lender claims increased costs, illegality or right to payment arising from the
same act or condition and such claims are received by the Borrower within 30
days of each other then the Borrower may substitute all, but not (except to the
extent the Borrower has already substituted one of such Affected Lenders before
the Borrower's receipt of the other Affected Lenders' claim) less than all,
Lenders making such claims. In the event that the proposed substitute financial
institution or other entity is reasonably acceptable to the Administrative Agent
and the written notice was properly issued under this Section 2.12, the Affected
Lender shall sell and the substitute financial institution or other entity shall
purchase, pursuant to an Assignment and Acceptance, all rights and claims of
such Affected Lender under the Loan Documents and the substitute financial
institution or other entity shall assume all prior unperformed obligations of
the Affected Lender under the Loan Documents (other than in respect of any
damages (other than exemplary or punitive damages, to the extent permitted by
applicable law) in respect of any such unperformed obligations). Upon the
effectiveness of such sale, purchase and assumption (which, in any event shall
be conditioned upon the payment in full by the Borrower to the Affected Lender
in cash of all fees, unreimbursed costs and expenses and indemnities accrued and
unpaid through such effective date), the substitute financial institution or

                                       36
<PAGE>

other entity shall become a "Lender" hereunder for all purposes of this
Agreement having an interest in the Obligations in the amount of such Affected
Lender's Advances made by it provided that all indemnities under the Loan
Documents shall continue in favor of such Affected Lender.

                                  ARTICLE III

                           Conditions To Restatement

          Section 3.1.  Conditions Precedent. The Existing Credit Agreement
                        --------------------
shall be amended and restated to read in full as set forth herein on the date
(the "Restatement Date") on which the Administrative Agent shall notify the
Borrower that the following conditions precedent have been satisfied (unless
waived by the Requisite Lenders or the time for satisfaction thereof has been
extended by the Administrative Agent):

          (a)  Certain Documents. The Administrative Agent shall have received
on the Restatement Date each of the following, each dated the Restatement Date
unless otherwise indicated or agreed to by the Administrative Agent, in form and
substance satisfactory to the Administrative Agent and in sufficient copies for
each Lender:

               (i)    this Agreement, duly executed and delivered by each
     Obligor listed on the signature pages hereto, the Lenders and the
     Administrative Agent and, for the account of each Lender requesting the
     same, the Notes duly executed by the Borrower;

               (ii)   the Terra Canada Junior Guaranty, duly executed by the
     Borrower.

               (iii)  each Collateral Document, duly executed by each Obligor
     expressed to be a party thereto (and, in respect of the Canadian Security
     Documents, amended to the extent necessary to ensure that each such
     Collateral Document extends to secure in full the Borrower's Obligations),
     together with (but in respect of the Terra Canada Security Documents, only
     to the extent not previously delivered to the Collateral Agent or otherwise
     required by it to be updated):

                    (A)  evidence satisfactory to the Administrative Agent that
          the Collateral Agent (for the benefit of the Secured Parties) has
          (subject only to Customary Permitted Liens) a valid and perfected
          first priority security interest in the Collateral, including (A) such
          documents duly executed by each Loan Party as the Administrative Agent
          may request with respect to the perfection of its security interests
          in the Collateral (including evidence satisfactory to the
          Administrative Agent that financing statements under the UCC and the
          Personal Property Security Act (Ontario) (the "PPSA") and other
          applicable documents under the laws of any jurisdiction have been
          appropriately filed with respect to the perfection of Liens created by
          the Collateral Documents) and (B) copies of UCC search reports, PPSA
          search reports and the equivalent in each other relevant jurisdiction
          as of a recent date listing all effective financing statements that
          name any Loan Party as debtor, together with copies of such financing
          statements, none of which shall cover the Collateral except for those
          which shall

                                       37
<PAGE>

          be terminated on the Restatement Date) and (C) evidence of termination
          and release of any existing Liens which are not Permitted Liens);

                    (B)  share certificates representing all certificated
          Pledged Stock being pledged pursuant to the Collateral Documents and
          stock powers for such share certificates executed in blank;

                    (C)  all instruments representing pledged notes (including
          the notes evidencing the Terra UK Debt and the TNLP Debt) and
          collateral therefor being pledged pursuant to the Junior Collateral
          Documents duly endorsed in favor of the Collateral Agent or in blank;
          and

                    (D)  Control Account Letters (as defined in the Pledge and
          Security Agreement) from (A) all securities intermediaries with
          respect to all securities accounts and securities entitlements of each
          applicable Loan Party, and (B) all futures commission agents and
          clearing houses with respect to all commodities contracts and
          commodities accounts held by each applicable Loan Party;

                    (E)  Evidence of the completion of all recordings and
          filings as may be necessary or, in the opinion of the Administrative
          Agent, desirable to perfect and protect the Liens created by the
          Pledge and Security Agreement on certain intellectual property;

                    (F)  in respect of the Mortgages together: (x) (in respect
          of mortgaged Real Property which is located in the United States)
          title insurance policies, current as-built surveys, zoning letters,
          certificates of occupancy, (in respect of all mortgaged Real Property)
          documents of title and title reports in each case satisfactory in form
          and substance to the Administrative Agent, in its sole discretion; (y)
          evidence that counterparts of the Mortgages have been recorded (except
          as permitted, in respect of Real Property in England, under Section
          7.11) in all places to the extent necessary or desirable, in the
          judgment of the Administrative Agent, to create a valid and
          enforceable first priority lien (subject only to Customary Permitted
          Liens) on property described therein in favor of the Collateral Agent
          for the benefit of the Secured Parties (or in favor of such other
          trustee as may be required or desired under local law); and (z) an
          opinion of counsel in each state or jurisdiction in which any Mortgage
          is recorded in form and substance and from counsel reasonably
          satisfactory to the Administrative Agent;

               (iv)   a favorable opinion of (A) Kirkland & Ellis, counsel to
     each of the Loan Parties in substantially the form of Exhibit C, (B)
     counsel to the Loan Parties in England and Canada and in each other
     relevant jurisdiction in the United States, addressed to the Administrative
     Agent and the Lenders and addressing such matters as any Lender through the
     Administrative Agent may reasonably request and (C) counsel to the
     Administrative Agent as to the enforceability of the Credit Agreement and
     the other Loan Documents to be executed on the Restatement Date;

               (v)    the Loan Purchase Agreement and the Intercreditor
     Agreement each duly executed by the parties thereto;

                                       38
<PAGE>

               (vi)    a copy of the articles or certificate of incorporation
     (or equivalent organizational documents under its jurisdiction of
     incorporation) of each Loan Party, certified (other than for Terra UK) as
     of a recent date by the Secretary of State of the state or jurisdiction of
     incorporation of such Loan Party or by another Person acceptable to the
     Administrative Agent, together with certificates of such official attesting
     to the good standing of each such Loan Party in each state in which it
     conducts business and (in respect of the Borrower) a certificate of status
     of the Ontario Ministry of Consumer and Commercial Relations to the effect
     that the Borrower is a corporation under the Business Corporations Act
     (Ontario) and has not been dissolved;

               (vii)   a certificate of the Secretary or an Assistant Secretary
     of each Loan Party certifying (A) the names and true signatures of each
     officer of such Loan Party who has been authorized to execute and deliver
     any Loan Document or other document required hereunder to be executed and
     delivered by or on behalf of such Loan Party, (B) the by-laws (or
     equivalent Constituent Document) of such Loan Party as in effect on the
     date of such certification, (C) the resolutions of such Loan Party's Board
     of Directors (or equivalent governing body) approving and authorizing the
     execution, delivery and performance of this Agreement and the other Loan
     Documents to which it is a party and (D) that there have been no changes in
     the certificate of incorporation (or equivalent Constituent Document) of
     such Loan Party from the certificate of incorporation (or equivalent
     Constituent Document) delivered pursuant to the immediately preceding
     clause;

               (viii)  a certificate of the Chief Financial Officer of the
     Borrower, stating that it is Solvent both before and after giving effect to
     the transactions contemplated by this Agreement (at the Restatement Date)
     and the other Loan Documents and the payment and accrual of all transaction
     costs in connection with the foregoing;

               (ix)    a certificate of a Responsible Officer to the effect that
     (i) the representations and warranties set forth in Article IV and in the
     other Loan Documents shall be true and correct on and as of the Restatement
     Date and shall be true and correct in all material respects on the
     Restatement Date as though made on and as of such date, except to the
     extent such representations and warranties expressly relate to an earlier
     date, (ii) no Default or Event of Default has occurred and is continuing
     and no Pre-Closing Material Adverse Change has occurred.

               (x)     no litigation not listed on Schedule 4.7 shall have been
     commenced against any Loan Party or any of its Subsidiaries which is
     reasonably likely to be adversely determined and, if adversely determined,
     would have a Material Adverse Effect and (ii) no Pre-Closing Material
     Adverse Change has occurred;

               (xi)    evidence satisfactory to the Administrative Agent and the
     Lenders that the insurance policies required by Section 7.5 and any
     Collateral Document are in full force and effect, together with
     endorsements naming the Collateral Agent, on behalf of the Secured Parties,
     as an additional insured and/or loss payee under all insurance policies to
     be maintained with respect to the properties of Terra Industries, the
     Obligors and each of their Subsidiaries; and

                                       39
<PAGE>

               (xii)   such other certificates, documents, agreements and
     information respecting any Loan Party as any Lender through the
     Administrative Agent may reasonably request.

          (b)  Cash Management. The Administrative Agent shall have received
evidence that, as of the Restatement Date, the procedures with respect to cash
management required by Section 7.12 and the Collateral Documents have been
established and are currently being maintained by each Loan Party, together with
copies of all executed Lockbox Agreements and blocked account agreements
executed by such Loan Party in connection therewith.

          (c)  Fees and Expenses Paid. There shall have been paid to the
Administrative Agent, for the account of the Administrative Agent, and the
Lenders, as applicable, all accrued but unpaid interest arising in respect of
the Advances on the Restatement Date (together with any amounts payable pursuant
to Section 2.7(e) to the extent that the Restatement Date occurs prior to the
end of any Interest Period applicable to any portion of the Advances), all
accrued but unpaid fees owing under the Existing Credit Agreement on the
Restatement Date and all other fees due and payable on or before the Restatement
Date and all expenses due and payable on or before the Restatement Date.

          (d)  Consents, Etc. Each Loan Party shall have received all consents
and authorizations required pursuant to any material Contractual Obligation with
any other Person and shall have obtained all consents and authorizations of, and
effected all notices to and filings with, any Governmental Authority, in each
case, as may be necessary to allow each of the Loan Parties lawfully (A) to
execute, deliver and perform, in all material respects, their respective
obligations hereunder, the Loan Documents to which each of them, respectively,
is, or shall be, a party and each other agreement or instrument to be executed
and delivered by each of them, respectively, pursuant thereto or in connection
therewith, and (B) to create and perfect the Liens on the Collateral to be owned
by each of them in the manner and for the purpose contemplated by the Loan
Documents.

          (e)  Material Documents. Delivery to the Administrative Agent of
certified copies of all Material Documents, together with a Certificate of the
Secretary or an Assistant Secretary of Terra Capital that, as of the Restatement
Date, such Material Documents of which copies are attached thereto (i) are true
and complete copies of the originals thereof and (ii) are in full force and
effect and have not been modified from such attached copies.

          (f)  Process Agent. Terra Industries shall have been appointed New
York service of process agent in connection with the Loan Documents by the
Borrower and Terra UK.

          (g)  Closing of the Revolving and Term Credit Agreement. The Closing
Date (as defined in the Revolving and Term Credit Agreement) shall have occurred
or shall occur contemporaneously with the Restatement Date.

          (h)  Representations and Warranties. The representations and
warranties contained in each Loan Document shall be correct on and as of the
Restatement Date, before and after giving effect to the amendment and
restatement of the Existing Credit Agreement provided for hereby, as though made
on and as of such date (or, if any such representation or warranty is expressly
stated to have been made as of a specific date, as of such specific date); and

                                       40
<PAGE>

          (i)  No Defaults or Events of Default. No event has occurred and is
continuing, or would result from the transactions contemplated hereby to occur
on the Restatement Date, that constitutes a Default or an Event of Default.

          Section 3.2.  Borrower's Collateral Confirmation.
                        ----------------------------------

          Each Obligor hereby confirms that each of the Terra Canada Security
Documents continue in full force and effect to secure the Obligations of such
Obligor hereunder and all other Obligations of such Obligor arising under the
Loan Documents.

                                  ARTICLE IV

                         Representations and Warranties

          To induce the Lenders and the Administrative Agent to enter into this
Agreement, each of the Obligors represents and warrants to the Lenders and the
Administrative Agent that, on and as of the Restatement Date:

          Section 4.1.  Corporate Existence; Compliance with Law. Each Loan
                        ----------------------------------------
Party (a) is duly organized, validly existing and in good standing under the
laws of the jurisdiction of its incorporation; (b) is duly qualified as a
foreign corporation and in good standing under the laws of each jurisdiction
where such qualification is necessary, except where the failure to be so
qualified or in good standing would not have a Material Adverse Effect; (c) has
all requisite power and authority and the legal right to own, pledge, mortgage
and operate its properties, to lease the property it operates under lease and to
conduct its business as now or currently proposed to be conducted; (d) is in
compliance with its Constituent Documents; (e) is in compliance with all
applicable Requirements of Law except where the failure to be in compliance
would not in the aggregate have a Material Adverse Effect; and (f) has all
necessary licenses, permits, consents or approvals from or by, has made all
necessary filings with, and has given all necessary notices to, each
Governmental Authority having jurisdiction, to the extent required for such
ownership, operation and conduct, except for licenses, permits, consents,
approvals or filings which can be obtained or made by the taking of ministerial
action to secure the grant or transfer thereof or the failure to obtain or make
would not in the aggregate have a Material Adverse Effect.

          Section 4.2.  Corporate Power; Authorization; Enforceable Obligations.
                        -------------------------------------------------------

          (a)  The execution, delivery and performance by each Loan Party of the
Loan Documents to which it is a party and the consummation of the transactions
contemplated thereby:

               (i)    are within such Loan Party's corporate, limited liability
     company, partnership or other powers;

               (ii)   have been duly authorized by all necessary corporate
     action, including the consent of shareholders where required;

               (iii)  do not and will not (A) contravene any Loan Party's or any
     of its Subsidiaries' respective Constituent Documents, (B) violate any
     other applicable Requirement of Law applicable to any Loan Party (including
     Regulations U and X of the Federal Reserve Board), or any order or decree
     of any Governmental Authority or arbitrator applicable to any Loan Party,
     (C) conflict with or result in the breach of, or

                                       41
<PAGE>

     constitute a default under, or result in or permit the termination or
     acceleration of, any Contractual Obligation of any Loan Party or any of its
     Subsidiaries, or (D) result in the creation or imposition of any Lien upon
     any of the property of any Loan Party or any of its Subsidiaries, other
     than those in favor of the Secured Parties pursuant to the Collateral
     Documents; and

               (iv)   do not require the consent of, authorization by, approval
     of, notice to, or filing or registration with, any Governmental Authority
     or any other Person, other than those listed on Schedule 4.2 and which have
     been obtained or made, copies of which have been or will be delivered to
     the Administrative Agent pursuant to Section 3.1, and each of which on the
     Restatement Date will be in full force and effect and, with respect to the
     Collateral, filings required to perfect the Liens created by the Collateral
     Documents.

          (b)  This Agreement has been, and each of the other Loan Documents
will have been upon delivery thereof pursuant to the terms of this Agreement,
duly executed and delivered by each Loan Party thereto. This Agreement is, and
the other Loan Documents will be, when delivered hereunder, the legal, valid and
binding obligation of each Loan Party thereto, enforceable against such Loan
Party in accordance with its terms.

          Section 4.3.  Ownership of Subsidiaries.
                        -------------------------

          Set forth on Part I of Schedule 4.3 hereto is a complete and accurate
list showing, as of the Restatement Date, all Material Subsidiaries of Terra
Industries and, as to each such Subsidiary, the jurisdiction of its
incorporation, the number of shares of each class of Stock authorized (if
applicable), the number outstanding on the Restatement Date and the number and
percentage of the outstanding shares of each such class owned (directly or
indirectly) by Terra Industries.  No Stock of any Subsidiary of Terra Industries
is subject to any outstanding option, warrant, right of conversion or purchase
or any similar right (except in respect of the Common Units).  All of the
outstanding Stock of each Subsidiary of Terra Industries owned (directly or
indirectly) by Terra Industries has been validly issued, is fully paid and non-
assessable and is owned by Terra Industries or a Subsidiary of Terra Industries,
free and clear of all Liens (other than the Lien in favor of the Secured Parties
created pursuant to the Collateral Documents or the Canadian Collateral
Documents).  Except as set forth in Schedule 4.3, neither Terra Industries nor
any such Subsidiary is a party to, or has knowledge of, any agreement binding on
it which restricts the transfer or hypothecation of any Stock of any such
Subsidiary, other than the Loan Documents.  Terra Industries does not own or
hold, directly or indirectly, any Stock of any Person other than such
Subsidiaries and Investments permitted by Section 8.3.

          Section 4.4.  Financial Statements.
                        --------------------

          (a)  The consolidated balance sheet of Terra Industries and its
Subsidiaries as at December 31, 1998, and the related consolidated statements of
income, retained earnings and cash flows of Terra Industries and its
Subsidiaries for the fiscal year then ended, certified by Deloitte & Touche LLP,
and the consolidated balance sheets of Terra Industries and its Subsidiaries as
at September 30, 1999, and the related consolidated statements of income,
retained earnings and cash flows of Terra Industries and its Subsidiaries for
the 9 months then ended, copies of which have been furnished to each Lender,
fairly present (in all material respects), subject, in the case of said balance
sheets as at September 30, 1999, and said statements of income, retained
earnings and cash flows for the 12 months then ended, to the absence of

                                       42
<PAGE>

footnote disclosure and normal recurring year-end audit adjustments, the
consolidated financial condition of Terra Industries and its Subsidiaries as at
such dates and the consolidated results of the operations of Terra Industries
and its Subsidiaries for the period ended on such dates, all in conformity with
GAAP.

          (b)  Neither Terra Industries nor any of its Subsidiaries has any
material obligation, contingent liability or liability for taxes, long-term
leases or unusual forward or long-term commitment which is not either (i)
reflected in the Financial Statements referred to in clause (a) above or in the
notes thereto or (ii) permitted by this Agreement.

          (c)  The Projections have been prepared by Terra Industries in light
of the past operations of its business, and reflect projections for the fiscal
periods covered thereby on a month by month basis for the first year and on a
year by year basis thereafter. The Projections are based upon estimates and
assumptions stated therein, all of which Terra Industries believes to be
reasonable and fair in light of current conditions and current facts known to
Terra Industries and at the time such Projections were prepared and reflect
Terra Industries' good faith and reasonable estimates of the future financial
performance of Terra Industries and its Subsidiaries and of the other
information projected therein for the periods set forth therein (it being
understood that no representation is made that such Projections will be
realized).

          (d)  The unaudited pro forma consolidated and consolidating balance
sheet of Terra Industries and its Subsidiaries (the "Pro Forma Balance Sheet")
contained in Schedule 4.4 has been prepared as of February 29, 2000, reflects as
of such date, on a pro forma basis, the consolidated financial condition of
Terra Industries and its Subsidiaries, and the assumptions expressed therein
were reasonable based on the information available to Terra Industries at the
time so prepared and on the Restatement Date.

          Section 4.5.  Material Adverse Change. Since December 31, 1998, there
                        -----------------------
has been no Material Adverse Change and there have been no events or
developments that in the aggregate have had a Material Adverse Effect.

          Section 4.6.  Solvency. Both before and after giving effect to (a) the
                        --------
Loans and Letter of Credit Obligations to be made or extended on the Restatement
Date or such other date as Loans and Letter of Credit Obligations requested
hereunder are made or extended, (b) the disbursement of the proceeds of such
Loans pursuant to the instructions of the Borrower, and the consummation of the
other financing transactions contemplated hereby and (c) the payment and accrual
of all transaction costs in connection with the foregoing, each Loan Party is
Solvent.

          Section 4.7.  Litigation. There are no pending or, to the knowledge of
                        ----------
Terra Industries or the Borrower, threatened actions, investigations or
proceedings affecting Terra Industries or any of its Material Subsidiaries
before any court, Governmental Authority or arbitrator which would reasonably be
expected to be adversely determined and which, if adversely determined would
have a Material Adverse Effect. The performance of any action by any Loan Party
required or contemplated by any of the Loan Documents is not restrained or
enjoined (either temporarily, preliminarily or permanently). Schedule 4.7 lists
all litigation pending against any Loan Party at the date hereof which, if
adversely determined, would have a Material Adverse Effect.

                                       43
<PAGE>

          Section 4.8.  Taxes.
                        -----

          (a)  All federal, state, provincial, local and foreign income and
franchise and other material tax returns, reports and statements (collectively,
the "Tax Returns") required to be filed by Terra Industries and each of its
Subsidiaries and its Tax Affiliates have been filed with the appropriate
Governmental Authorities in all jurisdictions in which such Tax Returns are
required to be filed, all such Tax Returns are true and correct in all material
respects, and all material taxes, charges and other impositions reflected
therein or otherwise due and payable have been paid prior to the date on which
any fine, penalty, interest, late charge or loss may be added thereto for non-
payment thereof except where contested in good faith and by appropriate
proceedings if adequate reserves therefor have been established on the books of
Terra Industries and each of its Subsidiaries or such Tax Affiliate in
conformity with GAAP. Except as set forth on Schedule 4.8 (or as otherwise
notified from time to time after the Restatement Date in writing to the
Administrative Agent) no Tax Return is under audit by any Governmental Authority
and no notice of such an audit or any assertion of any claim for Taxes has been
given or made by any Governmental Authority. Proper and accurate amounts have
been withheld by each Loan Party and each of its Tax Affiliates from their
respective employees for all periods in compliance (in all material respects)
with the tax, social security and unemployment withholding provisions of
applicable Requirements of Law and such withholdings have been timely paid to
the respective Governmental Authorities.

          (b)  Neither Terra Industries, any of its Subsidiaries or any of its
Tax Affiliates has (i) except as set forth on Schedule 4.8 (or as otherwise
notified from time to time after the Restatement Date in writing to the
Administrative Agent) executed or filed with the IRS or any other Governmental
Authority any agreement or other document extending, or having the effect of
extending, the period for the filing of any Tax Return or the assessment or
collection of any charges; (ii) any obligation under any tax sharing agreement
or arrangement other than that to which the Administrative Agent has a copy
prior to the date hereof; or (iii) been a member of an affiliated, combined or
unitary group other than the group of which Terra Industries is the common
parent.

          Section 4.9.  Full Disclosure.
                        ---------------

          The written information prepared or furnished by the Loan Parties or
on their behalf (by their officers or advisors (including legal, environmental
and financial advisors and consultants)) in connection with this Agreement and
the Revolving and Term Credit Agreement or the consummation of the financing
when taken as a whole does not contain any untrue statement of a material fact
or omit to state a material fact necessary to make the statements contained
therein or herein not misleading.

          Section 4.10.  Margin Regulations. Neither Terra Industries nor its
                         ------------------
Material Subsidiaries is engaged in the business of extending credit for the
purpose of purchasing or carrying margin stock (within the meaning of Regulation
U of the Federal Reserve Board), and no proceeds of any Borrowing will be used
to purchase or carry any margin stock or to extend credit to others for the
purpose of purchasing or carrying any margin stock in contravention of
Regulation U or X of the Federal Reserve Board.

                                       44
<PAGE>

          Section 4.11.  No Burdensome Restrictions; No Defaults.
                         ---------------------------------------

          (a)  Neither Terra Industries nor any of its Subsidiaries (i) is a
party to any Contractual Obligation the compliance with which would have a
Material Adverse Effect or the performance of which by any thereof, either
unconditionally or upon the happening of an event, will result in the creation
of a Lien (other than a Lien permitted under Section 8.2) on the property or
assets of any thereof or (ii) is subject to any charter or corporate restriction
which would have a Material Adverse Effect.

          (b)  Neither Terra Industries nor any of its Subsidiaries is in
default under or with respect to any Contractual Obligation owed by it and, to
the knowledge of the Obligors, no other party is in default under or with
respect to any Contractual Obligation owed to Terra Industries or its
Subsidiaries, other than, in either case, those defaults which in the aggregate
would not have a Material Adverse Effect.

          (c)  No Default or Event of Default has occurred and is continuing.

          (d)  applicable to any Loan Party the compliance with which by such
Loan Party would have a Material Adverse Effect.

          Section 4.12.  Investment Company Act; Public Utility Holding Company
                         ------------------------------------------------------
Act. Neither Terra Industries nor any of its Subsidiaries is (a) an "investment
---
company" or an "affiliated person" of, or "promoter" or "principal underwriter"
for, an "investment company," as such terms are defined in the Investment
Company Act of 1940, as amended or (b) a "holding company," or an "affiliate" or
a "holding company" or a "subsidiary company" of a "holding company," as each
such term is defined and used in the Public Utility Holding Act of 1935, as
amended.

          Section 4.13.  Use of Proceeds. The proceeds of the Advances have been
                         ---------------
used by the Borrowers solely to make equity investments in Terra UK in order to
fund, in part, the acquisition by Terra UK of certain assets from ICI Chemicals
&Polymers Limited and Imperial Chemical Industries plc.

          Section 4.14.  Insurance. All policies of insurance of any kind or
                         ---------
nature of Terra Industries or any of its Subsidiaries, including policies of
life, fire, theft, product liability, public liability, property damage, other
casualty, employee fidelity, workers' compensation and employee health and
welfare insurance, are in full force and effect and are of a nature and provide
such coverage as is sufficient and as is customarily carried by businesses of
the size and character of such Person. None of Terra Industries or any of its
Subsidiaries has been refused insurance for any material coverage which it had
applied or had any policy of insurance terminated (other than at its request).

          Section 4.15.  Labor Matters.
                         -------------

          (a)  There are no strikes, work stoppages, slowdowns or lockouts
pending or threatened against or involving Terra Industries or any of its
Subsidiaries, other than those which in the aggregate would not have a Material
Adverse Effect.

                                       45
<PAGE>

          (b)  There are no unfair labor practices, grievances or complaints
pending, or, to the Obligors' knowledge, threatened against or involving Terra
Industries or any of its Subsidiaries, nor are there any arbitrations or
grievances threatened involving Terra Industries or any of its Subsidiaries,
other than those which, in the aggregate, if resolved adversely to Terra
Industries or such Subsidiary, would not have a Material Adverse Effect.

          (c)  Except as set forth on Schedule 4.15, as of the Restatement Date,
there is no collective bargaining agreement covering any of the employees of
Terra Industries or its Subsidiaries.

          (d)  Schedule 4.15 sets forth as of the date hereof, all material
consulting agreements, executive employment agreements, executive compensation
plans, deferred compensation agreements, employee stock purchase and stock
option plans and severance plans of Terra Industries and any of its
Subsidiaries.

          Section 4.16.  ERISA.
                         -----

          (a)  Schedule 4.16 separately identifies as of the date hereof all
Title IV Plans, all Multiemployer Plans, and all Foreign Plans

          (b)  Each employee benefit plan of Terra Industries or any of its
Subsidiaries which is intended to qualify under Section 401 of the Code does so
qualify, and any trust created thereunder is exempt from tax under the
provisions of Section 501 of the Code, except where all such failures would not
have a Material Adverse Effect.

          (c)  Each Title IV Plan is in compliance in all material respects with
applicable provisions of ERISA, the Code and other Requirements of Law except
for non-compliances that in the aggregate would not have a Material Adverse
Effect.

          (d)  There has been no, nor is there reasonably expected to occur, any
ERISA Event which would have a Material Adverse Effect.

          (e)  Except to the extent set forth on Schedule 4.16, none of Terra
Industries, any of its Subsidiaries or any ERISA Affiliate would have any
Withdrawal Liability as a result of a complete withdrawal as of the date hereof
from any Multiemployer Plan.

          (f)  The accrued and vested liability under each Foreign Plan and
under all Foreign Plans in the aggregate does not exceed the amount of such
liability reflected in the Financial Statements by an amount which could
reasonably be expected to have a Material Adverse Effect, after taking into
account the availability of any assets of such Foreign Plan or otherwise
specifically allocable to such liability.

          Section 4.17.  Environmental Matters.
                         ---------------------

          (a)  Except as set forth on Schedule 4.17, the operations of Terra
Industries and each of its Subsidiaries have been and are in compliance with all
Environmental Laws, including obtaining and complying in all material respects
with all Permits required by Environmental Laws ("Environmental Permits"), other
than non-compliances that in the aggregate would not have a reasonable
likelihood of Terra Industries and its Subsidiaries incurring Environmental
Liabilities and Costs in excess of $1,000,000.

                                       46
<PAGE>

          (b)  Except as set forth on Schedule 4.17, Terra Industries and its
Subsidiaries have obtained and currently possess all Environmental Permits
necessary for their operations, all such Permits are in good standing and Terra
Industries and each of its Subsidiaries is in compliance with the terms and
conditions of such Permits except for failures that in the aggregate would not
have a reasonable likelihood of Terra Industries and its Subsidiaries incurring
Environmental Liabilities and Costs in excess of $1,000,000.

          (c)  Except as set forth on Schedule 4.17, none of the Terra
Industries or any of its Subsidiaries or any real property currently or, to its
knowledge, previously owned, operated or leased by or for Terra Industries or
any of its Subsidiaries is subject to any pending or, to its knowledge
threatened, written claim, order, agreement, notice of violation, notice of
potential liability or other allegation or is the subject of any pending or, to
its knowledge, threatened proceeding or governmental investigation under or
pursuant to Environmental Laws other than those that in the aggregate would not
have a reasonable likelihood of Terra Industries and its Subsidiaries incurring
Environmental Liabilities and Costs in excess of $1,000,000.

          (d)  Except as set forth on Schedule 4.17, none of Terra Industries or
any of its Subsidiaries is a treatment, storage or disposal facility requiring a
permit under the Resource Conservation and Recovery Act, 42 U.S.C. (S) 6901 et
seq., the regulations thereunder or any state analog.

          (e)  Except as set forth on Schedule 4.17, there are no facts,
circumstances or conditions arising out of or relating to the operations or
ownership of real property owned or operated by Terra Industries or any of its
Subsidiaries that could reasonably be expected to give rise to Environmental
Liabilities and Costs which are not specifically included in the financial
information furnished to the Lenders other than those that in the aggregate
would not have a reasonable likelihood of resulting in Terra Industries or any
of its Subsidiaries incurring Environmental Liabilities and Costs in excess of
$1,000,000.

          (f)  Except as set forth on Schedule 4.17, as of the date hereof, no
Environmental Lien has attached to any property of Terra Industries or any of
its Subsidiaries and to its knowledge no facts, circumstances or conditions
exist that could reasonably be expected to result in any such lien attaching to
any such property.

          (g)  Except as set forth on Schedule 4.17, Terra Industries and each
of its Subsidiaries has provided the Administrative Agent with copies of all
material environmental, health or safety audits, studies, assessments,
inspections, investigations or other environmental health and safety reports
relating to the operations of Terra Industries and its Subsidiaries or their
real property that are in the possession, custody or control of Terra Industries
or any of its Subsidiaries.

          Section 4.18.  Intellectual Property. Terra Industries and its
                         ---------------------
Subsidiaries own or license or otherwise have the right to use all licenses,
permits, patents, patent applications, trademarks, trademark applications,
service marks, trade names, copyrights, copyright applications, franchises,
authorizations and other intellectual property rights (including all
Intellectual Property as defined in the Pledge and Security Agreement) that are
necessary and material to the operations of their respective businesses, without
infringement upon or conflict with the rights of any other Person with respect
thereto, including all trade names associated with any material private label
brands of Terra Industries or any of its Subsidiaries. To the Obligors'
knowledge, no slogan or other advertising device, product, process, method,
substance, part or

                                       47
<PAGE>

component, or other material now employed, or now contemplated to be employed,
by Terra Industries or any of its Subsidiaries infringes upon or conflicts in
any material respect with any rights owned by any other Person, and no claim or
litigation regarding any of the foregoing is pending or threatened.

          Section 4.19.  Title; Real Property.
                         --------------------

          (a)  Schedule 4.19 sets forth all the Real Property (other than Non-
Material Real Property) owned by Terra Industries and its Material Subsidiaries
at the date hereof and each of Terra Industries and its Subsidiaries has good
and marketable title to, or valid leasehold interests in, all such Real Property
and good title to all personal property purported to be owned by it, including
those reflected on the most recent Financial Statements delivered by the
Obligors, and none of such properties and assets is subject to any Lien, except
Liens permitted under Section 8.2. Terra Industries and its Subsidiaries have
received all deeds, assignments, waivers, consents, non-disturbance and
recognition or similar agreements, bills of sale and other documents, and have
duly effected all recordings, filings and other actions necessary to establish,
protect and perfect in all material respects Terra Industries' and its Material
Subsidiaries' right, title and interest in and to all such property.

          (b)  Set forth on Schedule 4.19 hereto is a complete and accurate list
of all Real Property (other than Non-Material Real Property) owned and leased by
Terra Industries and its Material Subsidiaries showing as of the Restatement
Date the street address, county or other relevant jurisdiction, state, and
record owner. Each Loan Party has good, indefeasible and marketable fee simple
(or, where relevant, leasehold) title to all Real Property purported to be owned
by it, which ownership is free and clear of all Liens other than Liens created
or permitted by the Loan Documents.

          (c)  Except as set forth on Schedule 4.19 (or otherwise notified in
writing to the Administrative Agent in respect of Real Property acquired after
the Restatement Date), neither Terra Industries nor any of its Subsidiaries owns
or holds, or is obligated under or a party to, any option, right of first
refusal or other contractual right to purchase, acquire, sell, assign or dispose
of any Real Property (other than Non Material Real Property owned or leased by
Terra Industries or any of its Subsidiaries except as permitted by the Loan
Documents.

          (d)  All material components of all improvements included within the
Real Property (other than in respect of Non-Material Real Property) owned or
leased by Terra Industries or any of its Subsidiaries (collectively,
"Improvements"), including the roofs and structural elements thereof and the
heating, ventilation, air conditioning, plumbing, electrical, mechanical, sewer,
waste water, storm water, paving and parking equipment, systems and facilities
included therein, are in working order and repair to the extent necessary for
the effective and orderly conduct of the business, operations and activities of
Terra Industries and its Subsidiaries in all material respects (but in any event
to a standard not lower than that generally maintained by Terra Industries and
its Subsidiaries during the two year period preceding the Restatement Date). All
water, gas, electrical, steam, compressed air, telecommunication, sanitary and
storm sewage lines and systems and other similar systems serving the Real
Property owned or leased by Terra Industries or any of its Subsidiaries are
installed and operating and are sufficient to enable the Real Property owned or
leased by Terra Industries or its Subsidiaries to continue to be used and
operated in the manner currently being used and operated, and neither Terra
Industries nor any of its Subsidiaries has any knowledge of any factor or
condition that could result in the termination or material impairment of the
furnishing thereof. No Improvement

                                       48
<PAGE>

or portion thereof is dependent for its access, operation or utility on any
land, building or other Improvement not included in the Real Property owned or
leased by Terra Industries or any of its Subsidiaries or over which it has a
right of way or easement.

          (e)  No portion of any Real Property owned or leased by Terra
Industries or any of its Subsidiaries has suffered any material damage by fire
or other casualty loss which has not heretofore been substantially repaired and
restored to its original condition except with respect to which repair has been
commenced (as set forth on Schedule 4.19 (or otherwise notified in writing to
the Administrative Agent after the Restatement Date)) and is being diligently
progressed. Except as set forth on Schedule 4.19 (or otherwise notified in
writing to the Administrative Agent after the Restatement Date), no portion of
any Real Property owned or leased by Terra Industries or any of its Subsidiaries
is located in a special flood hazard area as designated by any federal
Governmental Authority.

          (f)  All Permits required to have been issued or appropriate to enable
all real property owned or leased by Terra Industries or any of its Subsidiaries
to be lawfully occupied and used for all of the purposes for which they are
currently occupied and used have been lawfully issued and are in full force and
effect, other than those which in the aggregate would not have a Material
Adverse Effect.

          (g)  None of Terra Industries or any of its Subsidiaries has received
any notice, or has any knowledge, of any pending, threatened or contemplated
condemnation proceeding affecting any real property owned or leased by Terra
Industries or any of its Subsidiaries or any part thereof, except those which,
in the aggregate, would not have a Material Adverse Effect.

          Section 4.20.  Year 2000 Compliance. None of the areas within the
                         --------------------
business and operations of each of Terra Industries and its Subsidiaries has
been adversely affected by the risk that computer applications used by Terra
Industries or its Subsidiaries were not Year 2000 Compliant and Terra Industries
and its Subsidiaries have developed and implemented a comprehensive program to
eliminate any future non-compliance.

          Section 4.21.  Canadian and English Requirements. This Agreement and
                         ---------------------------------
each of the other Loan Documents are in proper legal form under the laws of
Canada for the enforcement thereof against the Borrower under such laws, and
under the laws of England for the enforcement thereof against Terra UK under
such laws, and if each of the Loan Documents were stated to be governed by such
law, they would constitute legal, valid and binding obligations of the Borrower
or Terra UK, as the case may be, thereunder, enforceable in accordance with
their respective terms. All formalities (if any) required under the laws of
Canada (or, with respect to the Guaranty by Terra UK, England) for the validity
and enforceability of each of the Loan Documents (including, without limitation,
any necessary registration, recording or filing with any court or other
authority therein), except as otherwise provided herein, have been accomplished,
and no Taxes are required to be paid and no notarization is required, for the
validity and enforceability thereof.

          Section 4.22.  Pari Passu Obligations. This Agreement and the other
                         ----------------------
Loan Documents and the obligations evidenced hereby and thereby are and will at
all times be direct and unconditional general obligations of the Borrower and
Terra UK, and rank and will at all times rank in right of payment and otherwise
at least pari passu with all unsecured Indebtedness of the Borrower and Terra
UK, whether now existing or hereafter outstanding, subject to statutory

                                       49
<PAGE>

priority and the effect of bankruptcy and insolvency law. The Obligations of
Terra UK under Article XI are and will at all times be direct and unconditional
general obligations of Terra UK and rank and will at all times rank in right of
payment and otherwise at least pari passu with all unsecured Indebtedness of
Terra UK, whether now existing or hereafter outstanding, subject to statutory
priority and the effect of bankruptcy and insolvency law.

          Section 4.23.  No Immunity. Each of the Borrower and Terra UK is
                         -----------
subject to civil and commercial law with respect to its obligations under this
Agreement and each of the other Loan Documents. The execution, delivery and
performance by the Borrower and Terra UK of this Agreement and each of the other
Loan Documents constitute private and commercial acts rather than public or
governmental acts. Neither the Borrower, Terra UK nor any of their respective
properties or revenues is entitled to any right of immunity in any jurisdiction
from suit, court jurisdiction, judgment, attachment (whether before or after
judgment), set-off or execution of a judgment or from any other legal process or
remedy relating to the obligations of the Borrower or Terra UK, as the case may
be, under this Agreement or any of the other Loan Documents.

          Section 4.24.  Canadian Employee Benefit Plans.  Except as could not
                         -------------------------------
reasonably be expected to have a Material Adverse Effect, the Borrower and its
Subsidiaries have complied in all material respects with all applicable laws
regarding each Canadian Employee Benefits Plan (including, where applicable, the
Pension Benefits Act (Ontario) and the Income Tax Act (Canada)); and each
Canadian Employee Benefits Plan is, and has been, maintained and administered in
substantial compliance with its terms, applicable collective bargaining
agreements and all applicable laws (including, where applicable, the Pension
Benefits Act (Ontario) and the Income Tax Act (Canada)).  There exists no
outstanding liability of the Borrower or any of its Subsidiaries with respect to
any Canadian Employee Benefit Plan that has been terminated, which liability
could reasonably be expected to have a Material Adverse Effect.  The Borrower
and its Subsidiaries have paid when due all amounts which the Borrower and its
Subsidiaries are required to have paid under the terms of each Canadian Employee
Benefit Plan or applicable law as contributions to such Canadian Employee
Benefit Plan (excluding any nonpayment that could not reasonably be expected to
have a Material Adverse Effect); as of the date of the most recent audit
performed with respect to the Borrower's Canadian Employee Benefit Plans, no
accumulated funding deficiency, whether or not waived, resulting from the action
or inaction of the Borrower or any of its Subsidiaries existed with respect to
any Canadian Employee Benefit Plan; and, to the best knowledge of the Borrower,
no accumulated funding deficiency, whether or not waived, resulting from the
action or inaction of the Borrower or any of its Subsidiaries exists with
respect to any Canadian Employee Benefit Plan. Each Plan is fully funded, on a
going concern basis, in accordance with its terms and regulatory requirements as
outlined by the Pension Benefits Act (Ontario), administrative requirements of
the Financial Services Commission of Ontario and the Superintendent of Financial
Services and the most recent actuarial report filed with the Superintendent of
Financial Services in respect of such Plan, as and to the extent applicable,
except to the extent any failure to do so as to be so funded could not
reasonably be expected to have a Material Adverse Effect.  Neither the Borrower
nor any Subsidiary of the Borrower sponsors, maintains or contributes to, or has
at any time in the preceding six-year period sponsored, maintained or
contributed to any "multi-employer pension plan" (as defined in the Pension
Benefits Act (Ontario)).

                                       50
<PAGE>

                                   ARTICLE V

                              Financial Covenants

As long as any of the Obligations (in respect of the Advances, interest or fees
thereon and expenses related thereto) remain outstanding, unless the Requisite
Lenders otherwise consent in writing, Terra Industries agrees with the Lenders
and the Administrative Agent that:

          Section 5.1.  Minimum Cash Flow. Terra Industries will have, as of the
                        -----------------
last day of each Fiscal Quarter set forth below, Cash Flow for the number of
Fiscal Quarters indicated below ending on such day of not less than the
following:
<TABLE>
<CAPTION>
     ----------------------------------------------------------------
                 Fiscal Quarters                    Minimum Cash Flow
     ----------------------------------------------------------------
     <S>                                            <C>
     1 Fiscal Quarter ended March 31, 2000                  $0
     2 Fiscal Quarters ended June 30, 2000             $25,000,000
     3 Fiscal Quarters ended September 30, 2000        $35,000,000
     4 Fiscal Quarters ended December 31, 2000         $45,000,000
     ----------------------------------------------------------------
     4 Fiscal Quarters ended March 31, 2001            $57,000,000
     4 Fiscal Quarters ended June 30, 2001             $77,000,000
     4 Fiscal Quarters ended September 30, 2001        $83,000,000
     4 Fiscal Quarters ended December 31, 2001         $90,000,000
     ----------------------------------------------------------------
     4 Fiscal Quarters ended March 31, 2002 and        $90,000,000
     each 4 Fiscal Quarter period thereafter
     ----------------------------------------------------------------
</TABLE>

          Section 5.2.  Capital Expenditures, Common Unit Purchases and Joint
                        -----------------------------------------------------
Venture Investments. Terra Industries will not permit (a) Capital Expenditures
-------------------
(excluding any Capital Expenditures financed by insurance proceeds to the extent
permitted hereunder) to be made or incurred during each Fiscal Year set forth
below, (b) the aggregate Dollar amount expended during such Fiscal Year in
purchasing Common Units permitted under Section 8.3(h) and (c) the cash
Investments in joint ventures made during such Fiscal Year permitted under
Section 8.3(m), (i) in the case of clause (a) only, to be less than the minimum
amount set forth below and (ii) in the case of clauses (a), (b) and (c) in
aggregate to be in excess of the maximum amount set forth below, for such Fiscal
Year:
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------
           Fiscal Year                     Maximum Amount         Minimum Amount
--------------------------------------------------------------------------------
<S>                                        <C>                    <C>
Fiscal Year ended December 31, 2000         $25,000,000            $12,000,000
--------------------------------------------------------------------------------
Fiscal Year ended December 31, 2001         $35,000,000            $15,000,000
--------------------------------------------------------------------------------
Fiscal Year ended December 31, 2002         $35,000,000            $15,000,000
--------------------------------------------------------------------------------
</TABLE>

                                       51
<PAGE>

                                  ARTICLE VI

                              Reporting Covenants

          As long as any of the Obligations (in respect of the Advances,
interest or fees thereon and expenses related thereto) remain outstanding,
unless the Requisite Lenders (except as provided in Section 12.1) otherwise
consent in writing, the Obligors agree with the Lenders and the Administrative
Agent that:

          Section 6.1.  Financial Statements. Terra Industries shall furnish to
                        --------------------
the Lenders the following Financial Statements:

          (a)  Monthly Reports. Within 30 days after the end of each fiscal
month (other than March, June and September) in each Fiscal Year, financial
information regarding Terra Industries and its Subsidiaries consisting of
consolidated and consolidating unaudited balance sheets as of the close of such
month and the related statements of income and cash flow for such month and that
portion of the current Fiscal Year ending as of the close of such month, setting
forth in comparative form the figures for the corresponding period in the prior
year and the figures contained in the Projections, in each case certified by a
Responsible Officer of Terra Industries as fairly presenting the consolidated
and consolidating financial position of Terra Industries and its Subsidiaries as
at the dates indicated and the results of their operations and cash flow for the
periods indicated in accordance with GAAP (subject to the absence of footnote
disclosure and normal year-end audit adjustments).

          (b)  Quarterly Reports. Within 45 days after the end of each Fiscal
Quarter (other than a Fiscal Quarter ending December 31) in each Fiscal Year,
financial information regarding Terra Industries and its Subsidiaries consisting
of consolidated and consolidating unaudited balance sheets as of the close of
such quarter and the related statements of income and cash flow for such quarter
and that portion of the Fiscal Year ending as of the close of such quarter,
setting forth in comparative form the figures for the corresponding period in
the prior year and the figures contained in the Projections, in each case
certified by a Responsible Officer of Terra Industries as fairly presenting the
consolidated and consolidating financial position of Terra Industries and its
Subsidiaries as at the dates indicated and the results of their operations and
cash flow for the periods indicated in accordance with GAAP (subject to the
absence of footnote disclosure and normal year-end audit adjustments).

          (c)  Annual Reports. Within 90 days after the end of each Fiscal Year,
financial information regarding Terra Industries and its Subsidiaries consisting
of consolidated and consolidating balance sheets of Terra Industries and its
Subsidiaries as of the end of such year and related statements of income and
cash flows of Terra Industries and its Subsidiaries for such Fiscal Year, all
prepared in conformity with GAAP and certified, in the case of such consolidated
financial statements, without qualification as to the scope of the audit by
Deloitte & Touche LLP or other independent public accountants acceptable to the
Administrative Agent, together with the report of such accounting firm stating
that (i) such financial statements fairly present the consolidated financial
position of Terra Industries and its Subsidiaries as at the dates indicated and
the results of their operations and cash flow for the periods indicated in
conformity with GAAP applied on a basis consistent with prior years (except for
changes with which such independent certified public accountants shall concur
and which shall have been disclosed in the

                                       52
<PAGE>

notes to the financial statements), and (ii) the examination by such accountants
in connection with such consolidated financial statements has been made in
accordance with generally accepted auditing standards, and accompanied by a
certificate stating that in the course of the regular audit of the business of
Terra Industries and its Subsidiaries such accounting firm has obtained no
knowledge that a Default or Event of Default in respect of the financial
covenants contained in Article V has occurred and is continuing, or, if in the
opinion of such accounting firm, a Default or Event of Default has occurred and
is continuing in respect of such financial covenants, a statement as to the
nature thereof.

          (d)  Compliance Certificate. Together with each delivery of any
financial statement pursuant to clauses (b) and (c) of this Section 6.1, a
certificate of a Responsible Officer of the Borrower (each, a "Compliance
Certificate") (i) showing in reasonable detail the calculations used in
determining the Leverage Ratio (for purposes of determining the Applicable
Margin) and demonstrating compliance with each of the financial covenants
contained in Article V which is tested on a quarterly basis and (ii) stating
that, to the best of such Responsible Officer's knowledge, no Default or Event
of Default has occurred and is continuing or, if a Default or an Event of
Default has occurred and is continuing, stating the nature thereof and the
action which the Borrower proposes to take with respect thereto.

          (e)  Business Plan. Not later than 60 days after the end of each
Fiscal Year, and containing substantially the types of financial information
contained in the Projections delivered pursuant to clause (i) of the definition
of such term in Section 1.1, (i) the annual business plan of Terra Industries
for the next succeeding Fiscal Year approved by the Board of Directors of Terra
Industries, (ii) forecasts prepared by management of Terra Industries for each
fiscal month in the next succeeding Fiscal Year, and (iii) forecasts prepared by
management of Terra Industries for each of the succeeding Fiscal Years through
Fiscal Year 2002, including, in each instance described in clause (ii) and
clause (iii) above, (A) a projected year-end consolidated balance sheet and
income statement and statement of cash flows and (B) a statement of all of the
material assumptions on which such forecasts are based.

          (f)  Management Letters, Etc. Within five Business Days after receipt
thereof by any Loan Party, copies of each management letter, exception report or
similar letter or report received by such Loan Party from its independent
certified public accountants;

          (g)  Loans and Intercompany Loan Balances. Together with each delivery
of any financial statement pursuant to clauses (b) or (c) of this Section 6.1, a
summary of the outstanding Loans and Advances and the outstanding balance of all
Intercompany Indebtedness as of the last day of the fiscal quarter covered by
such financial statement (or more frequently as may be required by the
Administrative Agent), certified by a Responsible Officer.

          (h)  Additional Information. Promptly, from time to time, such other
information regarding the operations, including information regarding specific
product categories and lines of business of Terra Industries and its
Subsidiaries, business affairs and financial condition of Terra Industries or
any of its Subsidiaries, or compliance with the terms of any Loan Document, as
the Administrative Agent or any Lender may reasonably request.

          Section 6.2.  Default Notices. As soon as practicable, and in any
                        ---------------
event within five Business Days after a Responsible Officer of any Loan Party
has actual knowledge of the existence of any Default, Event of Default or other
event which has had a Material Adverse Effect or which has any reasonable
likelihood of causing or resulting in a Material Adverse

                                       53
<PAGE>

Change, the Borrower shall give the Administrative Agent notice specifying the
nature of such Default or Event of Default or other event, including the
anticipated effect thereof, which notice, if given by telephone, shall be
promptly confirmed in writing on the next Business Day.

          Section 6.3.  Litigation.  Promptly after the commencement thereof,
                        ----------
the Borrower shall give the Administrative Agent written notice of the
commencement of all actions, suits and proceedings before any domestic or
foreign Governmental Authority or arbitrator, affecting Terra Industries or any
of its Subsidiaries and known to a Responsible Officer, which in the reasonable
judgment of Terra Industries or such Subsidiary, could reasonably be expected to
expose Terra Industries or such Subsidiary to liability in an amount aggregating
$500,000 or more or which, if adversely determined, would have a Material
Adverse Effect.

          Section 6.4.  Asset Sales.  Prior to any Asset Sale anticipated to
                        -----------
generate in excess of $10,000,000 (or its Dollar Equivalent) in Net Cash
Proceeds, Terra Industries shall send the Administrative Agent a notice (a)
describing such Asset Sale or the nature and material terms and conditions of
such transaction and (b) stating the estimated Net Cash Proceeds anticipated to
be received by Terra Industries or any of its Subsidiaries.

          Section 6.5.  SEC Filings; Press Releases.  Promptly after the
                        ---------------------------
sending or filing thereof, the Borrower shall send the Administrative Agent
copies of (a) all reports which Terra Industries or any of its Material
Subsidiaries sends to its security holders generally, (b) all reports and
registration statements which Terra Industries or any of its Subsidiaries files
with the Securities and Exchange Commission or any national or foreign
securities exchange or the National Association of Securities Dealers, Inc., (c)
all press releases and (d) all other statements concerning material changes or
developments in the business of such Loan Party made available by any Loan Party
to the public.

          Section 6.6.  Labor Relations.  Promptly after a Responsible Officer
                        ---------------
becomes aware of the same, the Borrower shall give the Administrative Agent
written notice of (a) any material labor dispute to which Terra Industries or
any of its Material Subsidiaries is or may become a party, including any
strikes, lockouts or other disputes relating to any of such Person's plants and
other facilities, and (b) any Worker Adjustment and Retraining Notification Act
or related liability incurred with respect to the closing of any plant or other
facility of any of such Person.

          Section 6.7.  Tax Returns.  Upon the request of any Lender, through
                        -----------
the Administrative Agent, the Borrower will provide copies of all federal,
state, material local and foreign tax returns and reports filed by Terra
Industries or any of its Subsidiaries in respect of taxes measured by income
(excluding sales, use and like taxes).

          Section 6.8.  Insurance.  As soon as is practicable and in any event
                        ---------
within 90 days after the end of each Fiscal Year, the Borrower will furnish the
Administrative Agent (in sufficient copies for each of the Lenders) with (a) a
report in form and substance reasonably satisfactory to the Administrative Agent
and the Lenders outlining all material insurance coverage maintained as of the
date of such report by Terra Industries and its Material Subsidiaries and the
duration of such coverage and (b) an insurance broker's statement that all
premiums then due and payable with respect to such coverage have been paid.

          Section 6.9.  ERISA Matters.  The Borrower shall furnish the
                        -------------
Agent (with sufficient copies for each of the Lenders):

                                       54
<PAGE>

          (a)  promptly and in any event within 30 days after a Responsible
Officer of Terra Industries, any of its Material Subsidiaries or any ERISA
Affiliate knows or has reason to know that any ERISA Event has occurred;

          (b)  promptly and in any event within 10 days after a Responsible
Officer of Terra Industries, any of its Material Subsidiaries or any ERISA
Affiliate knows or has reason to know that a request for a minimum funding
waiver under Section 412 of the Code has been filed with respect to any Title IV
Plan or Multiemployer Plan, a written statement of a Responsible Officer of
Terra Industries describing such ERISA Event or waiver request and the action,
if any, which Terra Industries, its Subsidiaries and ERISA Affiliates propose to
take with respect thereto and a copy of any notice filed with the PBGC or the
IRS pertaining thereto;

          (c)  simultaneously with the date that Terra Industries, any of its
Material Subsidiaries or any ERISA Affiliate files a notice of intent to
terminate any Title IV Plan, if such termination would require material
additional contributions in order to be considered a standard termination within
the meaning of Section 4041(b) of ERISA, a copy of each notice.

          Section 6.10.  Environmental Matters.  The Borrower shall provide the
                         ---------------------
Administrative Agent promptly and in any event within 10 days of a Responsible
Officer of Terra Industries or any Subsidiary learning of any of the following,
written notice of any of the following:

          (a)  that any Loan Party is or may be liable to any Person as a result
of a Release or threatened Release which could reasonably be expected to subject
such Loan Party to Environmental Liabilities and Costs of $1,000,000 or more;

          (b)  the receipt by any Loan Party of notification that any real or
personal property of such Loan Party is subject to any Environmental Lien;

          (c)  the receipt by any Loan Party of any notice of violation of or
potential liability under, or knowledge by such Loan Party that there exists a
condition which could reasonably be expected to result in a violation of or
liability under any Environmental Law, except for violations and liabilities the
consequence of which in the aggregate would have no reasonable likelihood of
subjecting the Loan Parties collectively to Environmental Liabilities and Costs
of $1,000,000 or more;

          (d)  the commencement of any judicial or administrative proceeding or
investigation alleging a violation of or liability under any Environmental Law,
which in the aggregate, if adversely determined, would have a reasonable
likelihood of subjecting the Loan Parties collectively to Environmental
Liabilities and Costs of $1,000,000 or more;

          (e)  any proposed acquisition of stock, assets or real estate, or any
proposed leasing of property, or any other action by any Loan Party or any of
its Subsidiaries the consequences of which in the aggregate have reasonable
likelihood of subjecting the Loan Parties collectively to Environmental
Liabilities and Costs of $1,000,000 or more;

          (f)  any proposed action by any Loan Party or any of its Subsidiaries
or any proposed change in Environmental Laws which in the aggregate have a
reasonable likelihood of requiring the Loan Parties to obtain additional
environmental, health or safety Permits or make additional capital improvements
to obtain compliance with Environmental Laws that in each case

                                       55
<PAGE>

in the aggregate would cost $1,000,000 or more or subject the Loan Parties to
additional Environmental Liabilities and Costs of $1,000,000 or more; and

          (g)    upon written request by the Administrative Agent or by any
Lender through the Administrative Agent, following (i) the acquisition by a Loan
Party or its Subsidiary of a fee interest in any Real Property, (ii) the
occurrence of a Default or Event of Default pursuant to Section 7.10 or (iii)
the occurrence (or the reasonable belief by the Administrative Agent, following
consultation with the Borrower, of the occurrence) of any of the matters to be
notified by the Borrower under this Section 6.10, a report prepared by an
environmental consulting firm reasonably acceptable to the Administrative Agent
providing, as appropriate in the circumstances, an assessment of the status of
any Environmental Liabilities and Costs and other environmental, health or
safety compliance, hazard or liability issue arising in relation thereto, which
assessment shall be reasonable in scope in light of the circumstances, perceived
risks and the facts known at the time. Without limiting the foregoing, if the
Administrative Agent determines at any time that a material risk exists that any
such report will not be provided within a reasonable time following such request
the Administrative Agent may retain an environmental consulting firm to prepare
such report at the expense of the Borrower.

          Section 6.11.    Other Information.  The Borrower will provide the
                           -----------------
Administrative Agent or any Lender with such other information respecting the
business, properties, condition, financial or otherwise, or operations of Terra
Industries or any of its Subsidiaries as any Lender through the Administrative
Agent may from time to time reasonably request including, at the Borrower's
cost, such fixed asset appraisals as the Administrative Agent may reasonably
request from time to time.

          Section 6.12.    Material Documents.  The Borrower will provide to the
                           ------------------
Administrative Agent on or before the date of execution, or amendment, waiver or
consent (which amendment, waiver or consent shall comply with Section 8.11) in
respect of each Material Document, notification thereof together with a
certified copy of such Material Document or amendment, waiver or consent as
applicable.

          Section 6.13.    Foreign Benefit Plans.  The Borrower shall provide to
                           ---------------------
the Administrative Agent (with sufficient copies for each Lender) copies of each
material report (including applicable schedules) with respect to each Foreign
Plan or any trust created thereunder as the Administrative Agent (or any Lender,
through the Administrative Agent) may reasonably request.


                                  ARTICLE VII

                             Affirmative Covenants

          As long as any of the Obligations (in respect of the Advances,
interest or fees thereon and expenses related thereto) remain outstanding,
unless the Requisite Lenders (except as provided in Section 12.1) otherwise
consent in writing, each Obligor agrees with the Lenders and the Administrative
Agent that:

          Section 7.1.    Preservation of Corporate Existence, Etc.  Each
                          ----------------------------------------
Obligor shall, and shall cause each of its Subsidiaries to, preserve and
maintain its corporate or partnership existence, rights (charter and statutory)
and franchises, except (i) as permitted by Sections 8.3 and 8.4, (ii)
Anticipated Corporate Reorganization Transactions and (iii) the abandonment of
such

                                       56
<PAGE>

rights and franchises which are no longer necessary or desirable to the conduct
of the business of Terra Industries or its Subsidiaries and which abandonment
would not have a Material Adverse Effect.

          Section 7.2.    Compliance with Laws, Etc.  Each Obligor shall, and
                          -------------------------
shall cause each of its Subsidiaries to, comply with all applicable Requirements
of Law, Contractual Obligations and Permits (and maintain in full force and
effect all contracts constituting such Contractual Obligations and such
Permits), except where the failure so to comply would not in the aggregate have
a Material Adverse Effect.

          Section 7.3.    Conduct of Business.  Each Obligor shall, and shall
                          -------------------
cause each of its Subsidiaries to, (a) conduct its business in the ordinary
course and substantially in accordance with past practice and (b) use its
reasonable efforts, in the ordinary course and substantially in accordance with
past practice, to preserve its business and the goodwill and business of the
customers, advertisers, suppliers and others having business relations with each
Obligor or any of its Subsidiaries, except in each case where the failure to
comply with the covenants in each of clauses (a) and (b) above would not in the
aggregate have a Material Adverse Effect.

          Section 7.4.    Payment of Taxes, Etc.  Each Obligor shall, and shall
                          ---------------------
cause each of its Material Subsidiaries to, pay and discharge before the same
shall become delinquent, all material lawful governmental claims, taxes,
assessments, charges and levies, except where contested in good faith, by proper
proceedings and adequate reserves therefor have been established on the books of
such Obligor or the appropriate Subsidiary in conformity with GAAP.

          Section 7.5.    Maintenance of Insurance.  Each Obligor shall (i)
                          ------------------------
maintain, and cause to be maintained for each other Loan Party and each of its
Material Subsidiaries insurance with responsible and reputable insurance
companies or associations in such amounts and covering such risks as is usually
carried by companies engaged in similar businesses and owning similar properties
in the same general areas in which Terra Industries, such Obligor or such
Subsidiary operates, and such other insurance as may be reasonably requested by
the Requisite Lenders and the Administrative Agent (as a result of any report
delivered pursuant to Section 6.8 or the Lenders or Administrative Agent
becoming aware of any fact or circumstances following the Restatement Date which
would indicate that it would be prudent and consistent with industry practice
for such additional insurance to be obtained), and, in any event, all insurance
required by any Collateral Documents and (ii) cause all such insurance to name
the Collateral Agent on behalf of the Secured Parties as additional insured or
loss payee, as appropriate, and to provide that no cancellation, material
addition in amount or material change in coverage shall be effective until after
30 days' written notice thereof to the Administrative Agent.

          Section 7.6.    Access.  Each Obligor shall from time to time, permit,
                          ------
and shall cause each of its Subsidiaries to permit, the Administrative Agent and
the Lenders, or any agents or representatives thereof, within one Business Days
after written notification of the same (except that during the continuance of an
Event of Default, no such notice shall be required) to (a) examine and make
copies of and abstracts from the records and books of account of such Obligor
and each of its Subsidiaries, (b) visit the properties of such Obligor and each
of its Subsidiaries, (c) discuss the affairs, finances and accounts of such
Obligor and each of its Subsidiaries with any of their respective officers or
directors, and (d) communicate directly with the Obligors' independent certified
public accountants; provided, however, that the Obligors may participate in such
communication unless a Default or Event of Default has occurred and is

                                       57
<PAGE>

continuing). Each of the Obligors shall authorize their independent certified
public accountants to disclose to the Administrative Agent or any Lender any and
all financial statements and other information of any kind, as the
Administrative Agent or any Lender reasonably requests from any Obligor, any
other Loan Party or any of its Subsidiaries and which such accountants may have
with respect to the business, financial condition, results of operations or
other affairs of such Loan Party or any of its Subsidiaries.

          Section 7.7.    Keeping of Books.  Each Obligor shall, and shall cause
                          ----------------
each other Loan Party and each of its Subsidiaries to keep, proper books of
record and account, in which full and correct entries shall be made in
conformity with GAAP of all financial transactions and the assets and business
of Terra Industries, the Borrowers and each such Subsidiary.

          Section 7.8.    Maintenance of Properties, Etc.  Each Obligor shall,
                          ------------------------------
and shall cause each of its Subsidiaries to, maintain and preserve, (a) all of
its properties which are necessary in the conduct of its business in such
working order and condition to the extent necessary for the effective and
orderly conduct of the business, operations and activities of Terra Industries
and its Subsidiaries in all material respects (but in any event to a standard
not lower than that generally maintained by Terra Industries and its
Subsidiaries during the two year period preceding the Restatement Date), (b) all
rights, permits, licenses, approvals and privileges (including all Permits)
which are used or necessary in the conduct of its business, and (c) all
registered patents, trademarks, trade names, copyrights and service marks with
respect to its business; except where the failure to so maintain and preserve in
the aggregate would have no Material Adverse Effect.

          Section 7.9.    Application of Proceeds.  The Borrower shall use the
                          -----------------------
entire amount of the proceeds of the Advances as provided in Section 4.13.

          Section 7.10.    Environmental.  Each Obligor shall, and shall cause
                           -------------
each of its Subsidiaries to comply in all material respects with Environmental
Laws and, without limiting the foregoing, each Obligor shall, at their sole cost
and expense, upon receipt of a notification or otherwise obtaining knowledge of
any Release or other event that has a reasonable likelihood of Terra Industries
and its Subsidiaries incurring Environmental Liabilities and Costs in excess of
$1,000,000, (i) conduct or pay for consultants to conduct, tests or assessments
of environmental conditions at such operations or properties, including the
investigation and testing of subsurface conditions and (ii) take such Remedial
Action as required by Environmental Laws or as any Governmental Authority
lawfully requires or as is appropriate and consistent with good business
practice to address the Release or event; provided, however, that the Obligors
shall not be deemed to be in violation of this Section 7.10 where a failure to
comply with any provision hereof would not reasonably be expected to result in
Terra Industries and its Subsidiaries incurring Environmental Liabilities and
Costs in excess of $1,000,000,.

          Section 7.11.    Additional Collateral and Guaranties; Further
                           ---------------------------------------------
Assurances.
----------

          (a)    At least fifteen (15) Business Days prior to (i) entering into
(except under the Permitted Sale and Leaseback Transaction) any Lease (other
than a renewal of an existing Lease) for the principal place of business and
chief executive office of any Obligor (other than Terra UK) or any Guarantor or
any other Lease (including any renewal) in which the annual rental payments are
anticipated to equal or exceed $1,000,000 or (ii) acquiring of any material
owned real property, such Obligor shall, and shall cause such Guarantor to,
provide the

                                       58
<PAGE>

Administrative Agent written notice thereof. Upon written request of the
Administrative Agent, the Obligors shall, and shall cause such Subsidiary
Guarantor to, execute and deliver to the Administrative Agent, for the benefit
of the Secured Parties, immediately upon the acquisition of any such Lease or
owned real property, a mortgage, deed of trust, assignment or other appropriate
instrument evidencing a Lien upon any such Lease or real property, together with
such title policies, certified surveys, and local counsel opinions with respect
thereto and such other agreements, documents and instruments which the
Administrative Agent deems necessary or desirable, the same to be in form and
substance satisfactory to the Administrative Agent and to be subject only to (i)
Liens permitted under Section 8.2 and (ii) such other Liens as the
Administrative Agent may reasonably approve.

          (b)    To the extent not delivered to the Administrative Agent on or
before the Restatement Date, each of the Obligors agrees promptly to, or ensure
that each of its Material Subsidiaries shall promptly (or, to the extent legally
restricted from doing so at the date hereof, promptly following the removal of
such restriction), (i) execute and deliver to the Administrative Agent such
further, and such amendments to the, Collateral Documents as the Administrative
Agent deems necessary or advisable in order to grant to the Administrative
Agent, for the benefit of the Secured Parties, a perfected first priority
security interest in the Stock and Stock Equivalents and other debt Securities
of any Material Subsidiary which are owned by Terra Industries or any of its
Subsidiaries and requested to be pledged by the Administrative Agent provided,
however, that in no event shall any Loan Party or any of its Subsidiaries be
required to pledge in excess of 65% of the outstanding Stock of any first tier
Material Subsidiary that is not a Domestic Subsidiary or any of the outstanding
stock of any Subsidiary of such first tier Subsidiary (except to the extent that
such pledge is to secure the Obligations of the Borrower or the obligations
under any Guaranty of such Obligations), or (ii) deliver to the Administrative
Agent the certificates (if any) representing such Stock and Stock Equivalents
and other debt Securities, together with (A) in the case of such certificated
Stock and Stock Equivalents, undated stock powers endorsed in blank, and (B) in
the case of such certificated debt Securities, endorsed in blank, in each case
executed and delivered by a Responsible Officer of the Borrower or such
Subsidiary, as the case may be, (iii) cause such new Material Subsidiary (A) to
become a party to a Guaranty and the applicable Collateral Documents and (B) to
take such actions necessary or advisable to grant to the Administrative Agent
for the benefit of the Secured Parties a perfected security interest in the
Collateral described in the Collateral Documents with respect to such new
Material Subsidiary, including the filing of Uniform Commercial Code financing
statements in such jurisdictions as may be required by the Collateral Documents
or by law or as may be reasonably requested by the Administrative Agent and (iv)
if requested by the Administrative Agent, deliver to the Administrative Agent
legal opinions relating to the matters described above, which opinions shall be
in form and substance, and from counsel, reasonably satisfactory to the Agent;
provided, however, that such new Material Subsidiary, if not a Domestic
Subsidiary, shall only be required to guarantee and secure the Obligations of
Terra UK.

          (c)    Promptly upon TNCLP becoming, directly or indirectly, a wholly-
owned Subsidiary of Terra Industries through the acquisition of Common Units,
TNCLP and its Subsidiaries shall execute and deliver to the Administrative Agent
such additional documents as the Administrative Agent may reasonably request to
ensure that any Guaranty and Collateral provided by TNCLP or its Subsidiaries in
respect of the Obligations of TNLP shall extend to guaranty and secure all the
Obligations.

                                       59
<PAGE>

          (d)    Terra Industries and its Subsidiaries shall ensure that with
respect to the Ammonium Nitrate Hedging Agreement, any gas Hedging Contract and
any other Hedging Contract nominated by the Administrative Agent, all payments
to Terra Industries or its Subsidiaries thereunder by the applicable
counterparty thereto shall be made directly to a Cash Collateral Account or
Lockbox Account (approved for such purpose by the Administrative Agent) and an
irrevocable instruction (in form and substance satisfactory to the
Administrative Agent) shall have been given by Terra Industries or its relevant
Subsidiary to such counterparty to make payments thereunder to such Cash
Collateral Account or Lockbox Account.

          (e)    Promptly upon the reasonable request by the Administrative
Agent, each Obligor shall, and shall ensure that each of its Subsidiaries shall,
take such action as the Administrative Agent may request (including the
execution, amendment, delivery, filing and registration of any Loan Document or
other document, certificate, agreement or instrument) in order to correct any
material defect or error which may be discovered which impairs, or may fail to
provide, the intended legality, effectiveness, accuracy, perfection or priority
of any Loan Document.

          (f)    Within (i) 21 days of the date of this Agreement, Terra UK
shall provide to the Administrative Agent evidence of the timely registration of
the Debenture at Companies House in England and Wales; and (ii) the priority
period specified in the priority searches delivered under Section 3.1; and (iii)
in respect of the Real Property which is located in England, Terra UK shall
provide to the Administrative Agent evidence of the timely registration of the
Debenture at H.M. Land Registry in respect of all Real Property mortgaged
thereby.

          Section 7.12.    Cash Collateral Accounts and Cash Management System.
                           ---------------------------------------------------
As soon as reasonably practicable and in any event not later than 60 days
following the Restatement Date, each Obligor shall ensure that the following
accounts and cash management systems shall be implemented and maintained:

          (a)    Terra Capital, TNLP, Terra UK and the Borrower shall have
established Cash Collateral Accounts and Lockbox Accounts and Terra Capital
shall have established the US Concentration Account as set forth on Schedule
7.12 or as may otherwise be approved by the Administrative Agent.

          (b)    The Administrative Agent shall (subject as provided below)
possess sole dominion and control over the Cash Collateral Accounts and the US
Concentration Account. As long as any of the obligations under (and as defined
in) the Revolving and Term Credit Agreement or the Obligations (in each case in
respect of the Advances, Revolving Credit Outstandings, the Term Loans, interest
or fees thereon and expenses related thereto) or any of the Commitments remain
outstanding, no Loan Party nor any Person or entity claiming by, through or
under any Loan Party shall have any control over the use of, or any right to
effect a withdrawal from, any Cash Collateral Account or the US Concentration
Account; provided, however, that at such times as an Account Triggering Event
shall not have occurred and be continuing in respect of any Loan Party each of
Terra UK and the Borrower may by written notice instruct the Administrative
Agent to make payments from its Cash Collateral Account to its Disbursement
Account subject to and in accordance with the provisions of clauses (d)(ii) and
(iii) below. All amounts in the Cash Collateral Accounts of Terra Capital, TNLP
and (for Dollar denominated receivables) the Borrower shall be applied by the
Administrative Agent as specified in clause(d)(i) below.

                                       60
<PAGE>

          (c)    The Borrower and each Revolving Credit Borrower shall instruct
its Account Debtors to mail their remittances to a Lockbox and such Loan Party
shall take all steps necessary or desirable, in the Administrative Agent's sole
discretion, to cause its Account Debtors to mail their remittances to such
Lockbox. Each such Loan Party shall mail to its Lockbox any remittances received
directly by it as soon as possible (but in any event no later than the Business
Day immediately following receipt).

          (d)    Notwithstanding Section 12.1(a)(ix), the Borrower and each
Revolving Credit Borrower shall maintain a cash management system acceptable to
the Administrative Agent including one or more Lockboxes as follows:

                 (i)    In the case of Terra Capital and TNLP, such cash
     management system shall provide for (A) all funds received by each such
     Borrower to be deposited in a Lockbox or Lockbox Account covered by a
     Lockbox Agreement, (B) daily deposit of remittances received in the Lockbox
     to the Lockbox Account, (C) daily sweeping of the funds in the Lockbox
     Account to the US Concentration Account (provided that in respect of
     amounts in the Lockbox Accounts maintained with Security National, such
     amounts shall (unless the Administrative Agent otherwise requires) be swept
     to the US Concentration Account only on the written instruction of the
     relevant Loan Party, but that such amounts shall not otherwise be withdrawn
     from such Lockbox Accounts) and (D) upon receipt of notice from Terra
     Capital (as provided in the following sentence), allocation and transfer of
     such amounts in the US Concentration Account to the appropriate Cash
     Collateral Account of Terra Capital, TNLP or, if applicable the
     Disbursement Account of the Borrower. Terra Capital shall notify the
     Administrative Agent within two Business Days of the deposit of any
     proceeds of Collateral in the US Concentration Account which portion of
     such proceeds is owned by Terra Capital, TNLP or, if applicable, the
     Borrower. All funds on deposit in the Cash Collateral Accounts in respect
     of Terra Capital and TNLP shall be applied in the manner specified in
     Section 2.9(d) of the Revolving and Term Credit Agreement and in respect of
     the Borrower shall be applied as specified in clause (d)(ii)below.

                 (ii)   In the case of the Borrower, such cash management system
     shall provide for (A) all funds received by it to be deposited in a Lockbox
     or Lockbox Account covered by a Lockbox Agreement located in New York (in
     respect of US Dollar denominated receivables) and in Sarnia (in respect of
     all other receivables), (B) daily deposit of remittances received in each
     Lockbox to each corresponding Lockbox Account, (C) daily sweeping of the
     funds in the New York Lockbox Account to the US Concentration Account and
     (upon the written instruction of the Borrower) the transfer of the funds in
     the Sarnia Lockbox Account to a Disbursement Account of the Borrower or as
     the Borrower may otherwise instruct the Administrative Agent and (D) upon
     receipt of notice from Terra Capital (as provided in clause (d)(i) above),
     allocation and transfer of such amounts owned by the Borrower in the US
     Concentration Account to a Disbursement Account of the Borrower or as the
     Borrower may otherwise instruct the Administrative Agent.  The Borrower
     shall notify the Administrative Agent within two Business Days of the
     deposit of any proceeds of Collateral in either of the Lockboxes.   As long
     as no Account Triggering Event in respect of the Borrower has occurred and
     is continuing, all funds on deposit in the Lockbox or Lockbox Account of
     the Borrower or in the US Concentration Account (to the extent owned by it)
     shall, upon written notice from the Borrower to the Administrative Agent,
     be transferred to a Disbursement

                                       61
<PAGE>

     Account of the Borrower or as the Borrower may otherwise direct. Upon and
     during the continuance of an Account Triggering Event in respect of the
     Borrower, no amount in the Lockbox or Lockbox Account of the Borrower or in
     the US Concentration Account (to the extent owned by it) may be withdrawn
     therefrom without the approval of the Administrative Agent; provided,
     however, that except following and during the continuance of an Event of
     Default, no amounts in any of the foregoing accounts, or in any Cash
     Collateral Account, which are owned by the Borrower shall be applied in
     repayment (other than a voluntary prepayment pursuant to Section 2.4) of
     the Advances.

                 (iii)  In the case of Terra UK, such cash management system
     shall provide for (A) all funds received by it to be deposited in a Lockbox
     or Lockbox Account covered by a Lockbox Agreement located in London, (B)
     daily deposit of remittances received in each Lockbox to each corresponding
     Lockbox Account, (C) (upon the written instruction of Terra UK) the
     transfer of the funds in its Lockbox Accounts to a Disbursement Account of
     Terra UK or as Terra UK may otherwise instruct the Administrative Agent .
     Terra UK shall notify the Administrative Agent within two Business Days of
     the deposit of any proceeds of Collateral in its Lockbox. All funds on
     deposit in the Lockbox Account of Terra UK shall be applied in the manner
     specified in Section 2.9(d) of the Revolving and Term Credit Agreement;
     provided, however, that if no Account Triggering Event in respect of Terra
     UK has occurred and is continuing, upon written notice from Terra UK to the
     Administrative Agent, such funds may be transferred to a Disbursement
     Account of Terra UK. Upon and during the continuance of an Account
     Triggering Event in respect of Terra UK, no amount may be withdrawn from
     Terra UK's Lockbox Account without the approval of the Administrative
     Agent.

          (e)    The Borrower, Terra Capital, Terra UK and TNLP shall, not later
than the Restatement Date (or such later date as shall be acceptable to the
Administrative Agent in its sole discretion), deliver to the Administrative
Agent the Lockbox Agreements, covering such accounts as the Administrative Agent
shall direct, each duly executed by each party thereto.

          (f)    Any Loan Party may deposit any cash and Cash Equivalents held
by it, which are not required to be applied in any other manner under the Loan
Documents, into such collateral account as may be approved by the Administrative
Agent for the purpose of including such cash or Cash Equivalents in the
calculation of a Borrowing Base. The Administrative Agent shall possess sole
dominion and control over any such account and (notwithstanding Section
12.1(a)(ix)) any cash or Cash Equivalents deposited in such account for such
purpose may not subsequently be withdrawn by a Loan Party without the approval
of the Administrative Agent.

          (g)    The Administrative Agent may convert into Dollars any amount
not denominated in Dollars which is deposited in any Cash Collateral Account or
which is otherwise received by it from or for the account of any Loan Party
(which pursuant to the Loan Documents is to be applied to the payment of the
Obligations) and each Obligor hereby agrees to indemnify the Administrative
Agent and each other Indemnitee (as defined in Section 12.4(a)) from and against
any loss, liability, cost or expense incurred by it in connection with such
conversion and any Indemnitee entering into any currency exchange contract in
the ordinary course of business for such purpose.

          (h)    None of Terra Industries or its Subsidiaries shall, following
and during the continuance of an Account Triggering Event, a Default or Event of
Default, maintain cash or Cash Equivalents (other than in respect of those funds
referred to in Section 8.3(j)) in aggregate in

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<PAGE>

excess of $3,000,000 outside of those accounts which are Lockbox Accounts, the
US Concentration Account or Cash Collateral Accounts.

          Section 7.13.    Real Estate.
                           -----------

          (a)    Each Obligor shall, and shall ensure that each Loan Party
shall, use all commercially reasonable efforts to deliver within 30 days after
the Restatement Date (or such later date as shall be acceptable to the
Administrative Agent in its sole discretion) such Landlord Lien Waivers and
Bailee's Waivers as the Administrative Agent shall request in its sole
discretion exercised reasonably.

          (b)    Each Obligor shall, and shall cause each other Loan Party and
     each of its Subsidiaries to use all commercially reasonable efforts to, (i)
     comply in all material respects with all of their respective obligations
     under all of their respective Leases now or hereafter held respectively by
     them with respect to Real Property (other than Non-Material Real Property),
     including the Leases set forth in Schedule 4.19; (ii) not modify, amend,
     cancel, extend or otherwise change in any materially adverse manner any of
     the terms, covenants or conditions of any such Leases; (iii) not assign or
     sublet any other Lease if such assignment or sublet would have a Material
     Adverse Effect; (iv) provide the Administrative Agent with a copy of each
     notice of default under any Lease received by such Loan Party or any of its
     Subsidiaries immediately upon receipt thereof and deliver to the
     Administrative Agent a copy of each notice of default sent by such Loan
     Party or any of its Subsidiaries under any Lease simultaneously with its
     delivery of such notice under such Lease; and (v) notify the Administrative
     Agent at least 14 days prior to the date such Loan Party or any Subsidiary
     takes possession of, or becomes liable under, any new leased premises or
     Lease, whichever is earlier.

          Section 7.14.    Hedging Contracts.  Terra Industries and its
                           -----------------
Subsidiaries shall at all times maintain interest rate and natural gas Hedging
Contracts, on terms and with counterparties reasonably satisfactory to the
Administrative Agent and in accordance with their usual practices over the two
year period preceding the date of this Agreement, to provide protection to Terra
Industries and its Subsidiaries against fluctuations in interest rates and
natural gas prices.

                                 ARTICLE VIII

                              Negative Covenants

          As long as any of the Obligations (in respect of the Advances,
interest or fees thereon and expenses related thereto) remain outstanding,
without the written consent of the Requisite Lenders (except as provided in
Section 12.1), each Obligor agrees with the Lenders and the Administrative Agent
that:

          Section 8.1.    Indebtedness.  Terra Industries will not, and will not
                          ------------
permit any of its Subsidiaries to, directly or indirectly create, incur, assume
or otherwise become or remain directly or indirectly liable with respect to any
Indebtedness except:

          (a)    the Obligations;

          (b)    Indebtedness existing on the date of this Agreement and
disclosed on Schedule 8.1;

                                       63
<PAGE>

          (c)    Capital Lease Obligations and purchase money Indebtedness
incurred by Terra Industries or its Subsidiaries to finance the acquisition of
Fixed Assets in an aggregate outstanding principal amount not to exceed
$10,000,000 at any time; provided, however, that the Capital Expenditure related
thereto is otherwise permitted by Section 5.2;

          (d)    Indebtedness arising under a Permitted Sale Leaseback
Transaction;

          (e)    Renewals, extensions, refinancings and refundings of
Indebtedness permitted by clause (b) of this Section 8.1; provided, however,
that any such renewal extension, refinancing or refunding is in an aggregate
principal amount not greater than the principal amount of, and is on terms no
less favorable to Terra Industries or such Subsidiary, including as to weighted
average maturity, than the Indebtedness being renewed, extended, refinanced or
refunded;

          (f)    Intercompany Indebtedness which is a permitted Investment under
     Section 8.3(e).

          (g)    Indebtedness arising under any performance or surety bond
     entered into in the ordinary course of business;

          (h)    Obligations under Hedging Contracts required by Section 7.14 or
     as permitted by Section 8.17;

          (i)    unsecured Indebtedness not otherwise permitted under this
Section 8.1 in an aggregate outstanding principal amount not to exceed
$5,000,000 at any time;

          (j)    Indebtedness secured by Liens permitted under Section 8.2(i);

          (k)    Guarantees by Terra UK of Terra UK Customer Debt; provided
that:

                 (i)    the aggregate principal amount of such Debt so
     guaranteed by Terra UK with respect to any customer at any time shall not
     exceed 50% of the aggregate principal amount of the Terra UK Customer Debt
     of such customer outstanding at such time; and

                 (ii)   the aggregate principal amount of Terra UK Customer Debt
     guaranteed by Terra UK at any time during any Fiscal Year shall not exceed
     (x) (Pounds)15,000,000 minus (y) the aggregate amount of payments made by
     Terra UK under all such guarantees during such Fiscal Year;

          (l)    any other Intercompany Indebtedness.

          Section 8.2.    Liens, Etc.  Terra Industries will not, and will not
                          ----------
permit any of its Subsidiaries to, create or suffer to exist, any Lien upon or
with respect to any of its properties or assets, whether now owned or hereafter
acquired, or assign, or permit any of its Subsidiaries to assign, any right to
receive income, except for:

          (a)    Liens created pursuant to the Loan Documents;

                                       64
<PAGE>

          (b)    Liens existing on the date of this Agreement and disclosed on
Schedule 8.2 or expressly permitted by Section 8.3(e) or constituting cash
collateral for letters of credit issued by Bank of America N.A. (formerly
Nationsbank N.A.) and Rabobank Nederland, each as set forth on Schedule 8.1 (the
terms and amount of such cash collateral to be reasonably satisfactory to the
Requisite Lenders);

          (c)    Customary Permitted Liens of the Borrower and its Subsidiaries;

          (d)    purchase money Liens granted by the Borrower or any Subsidiary
of the Borrower (including the interest of a lessor under a Capital Lease and
Liens to which any property is subject at the time of the Borrower's or such
Subsidiary's acquisition thereof) securing Indebtedness permitted under Section
8.1(c) and limited in each case to the property purchased with the proceeds of
such purchase money Indebtedness or subject to such Capital Lease;

          (e)    any Lien securing the renewal, extension, refinancing or
refunding of any Indebtedness secured by any Lien permitted by clause (d) of
this Section 8.2 without any change in the assets subject to such Lien;

          (f)    Liens in favor of lessors, sublessors or licensors under any
lease or license otherwise permitted by this Agreement;

          (g)    Liens created pursuant to the Permitted Sale Leaseback
Transaction;

          (h)    Liens not otherwise permitted by the foregoing clauses of this
Section 8.2 securing obligations or other liabilities of any Loan Party;
provided, however, that the aggregate outstanding amount of such obligations and
liabilities secured by such Liens shall not exceed $1,000,000 at any time;

          (i)    Liens which are licenses and sub-licenses granted to Persons
     that are not Affiliates of Terra Industries or any of its Subsidiaries in
     the ordinary course of business and not interfering in any material respect
     with the business and operations of Terra Industries or any of its
     Subsidiaries; and

          (j)    Liens on property of any of Terra Industries and its
Subsidiaries (other than (i) property subject to Liens under the Collateral
Documents and (ii) Liens securing Indebtedness of Terra Industries or its
Subsidiaries) in favor of Terra Industries or any of its Subsidiaries to secure
Intercompany Indebtedness owing to Terra Industries or any of its Subsidiaries.

          Section 8.3.    Investments.  Terra Industries will not, and will not
                          -----------
permit any of its Subsidiaries to, directly or indirectly make or maintain any
Investment except:

          (a)    Investments existing on the date of this Agreement and
disclosed on Schedule 8.3;

          (b)    Investments in cash and Cash Equivalents, including those held
in bank accounts (but subject to Section 7.12(h)), and which (i) in respect of
Terra Industries and Terra Capital Holdings shall not together exceed in
aggregate $1,000,000 at any time (provided, however, as long as no Event of
Default has occurred and is continuing, such amount shall be

                                       65
<PAGE>

increased (but for a period of not more than three consecutive Business Days) to
the extent necessary to permit those Restricted Payments to be made that are due
and payable and are permitted to be made under Section 8.5(b)) and (ii) which
(at any time while Intercompany Indebtedness is outstanding which is owing to
Terra Industries or any of its Domestic Subsidiaries by any Subsidiary of Terra
Industries that is not a Domestic Subsidiary) shall not be held outside of the
United States in an aggregate amount which is in excess of $20,000,000 for more
than 5 consecutive Business Days;

          (c)    Investments in Accounts, contract rights and Chattel paper,
notes receivable and similar items arising or acquired in the ordinary course of
business substantially in accordance with the past practice of Terra Industries
and its Subsidiaries;

          (d)    Investments received in settlement of amounts due to Terra
Industries or any of its Subsidiaries effected in the ordinary course of
business;

          (e)    Investments in Intercompany Indebtedness (i) owing by or to
Terra Capital or any of the Terra Capital Guarantors (which are wholly-owned
Subsidiaries of Terra Capital) to or from Terra Capital or any of the Terra
Capital Guarantors (which are wholly-owned Subsidiaries of Terra Capital), (ii)
owing by or to Terra Capital to or from TNLP (provided that, (A) if such
Intercompany Indebtedness is owing by TNLP to Terra Capital, such Indebtedness
is evidenced by an intercompany promissory note payable to the order of Terra
Capital on demand and the obligations thereunder are subordinated to the
Obligations and secured by a Lien on the assets of TNLP, which note and security
shall be pledged in favor of, and on terms acceptable to, the Administrative
Agent and (B) no such Intercompany Indebtedness shall be permitted for the
purpose of TNLP or TNCLP making Restricted Payments), (iii) owing by Terra
Capital to Terra UK, or by Terra UK to Terra Capital which is incurred in the
ordinary course of business, (iv) owing by Terra Capital to the Borrower, or by
the Borrower a to Terra Capital which is incurred in the ordinary course of
business, or (v) owing by or to Terra UK to or from the Borrower;

          (f)    loans or advances to employees of Terra Capital or any of its
Subsidiaries in the ordinary course of business (other than for the purposes of
acquiring Stock), which loans and advances shall not exceed the aggregate
outstanding principal amount of $500,000 at any time;

          (g)    Investments (other than Intercompany Indebtedness and
Indebtedness which is referred to in clause (f) above) not otherwise permitted
hereby in an aggregate outstanding amount not to exceed $1,000,000 at any time;

          (h)    Investments by Terra Capital in Common Units purchased after
the Restatement Date; provided, however, that the amount of such Common Units
shall not in aggregate exceed 500,000 and the purchase price therefor shall not
in aggregate exceed $5,000,000 (which Investments shall be included in the
financial covenant calculation contained in Section 5.2);

          (i)    Investments which are permitted Indebtedness under Sections
8.1(a), (b), (c), (d), (e), (g), (h), (i), (j), or (k);

          (j)    Investments to match employee-directed funds under the Deferred
Supplemental Savings Plan;

                                       66
<PAGE>

          (k)    Investments which are non-cash Investments in Capital Stock
which are necessary (and only to the extent necessary) to effect the Anticipated
Corporate Reorganization;

          (l)    Equity Investments by (i) Terra Industries or any of its
wholly-owned Domestic Subsidiaries in any of its respective (directly) wholly-
owned Domestic Subsidiaries which is a Terra Capital Guarantor, (ii) by TNCLP or
any of its wholly-owned Domestic Subsidiaries in any of its respective
(directly) wholly-owned Domestic Subsidiaries which is a Borrower or Guarantor
in respect of the Obligations of TNLP, (iii) by the Borrower or any of its
wholly-owned Subsidiaries (which is incorporated in Canada) in any of its
respective (directly) wholly-owned Subsidiaries (which is incorporated in
Canada) which is a Guarantor in respect of the Obligations of the Borrower or
(iv) by Terra UK or any of its wholly-owned Subsidiaries (which is incorporated
in England and Wales) in any of its respective (directly) wholly-owned
Subsidiaries (which is incorporated in England and Wales) which is a Guarantor
in respect of the Obligations of Terra UK;

          (m)    Investments by Terra Industries or its Subsidiaries in any
joint venture with any Person which (i) are cash Investments (to the extent
permitted under Section 5.2) and (ii) are not cash Investments (to the extent
permitted under Section 8.4(g)); and

          (n)    Investments by Terra Industries and its Subsidiaries in Terra
Industries or any of its Subsidiaries.

          Section 8.4.    Sale of Assets.  Terra Industries will not, and will
                          --------------
not permit any of its Subsidiaries to, sell, convey, transfer, lease or
otherwise dispose of, any of its assets or any interest therein (including the
sale or factoring at maturity or collection of any accounts) to any Person, or
permit or suffer any other Person to acquire any interest in any of its assets
or, in the case of any Subsidiary, issue or sell any shares of such Subsidiary's
Stock or Stock Equivalent (any such disposition being an "Asset Sale"), except:

          (a)    the sale or disposition in the ordinary course of business of
Inventory, Cash Equivalents and precious metals recovered from spent catalysts;

          (b)    the sale or disposition of Equipment which has become obsolete
or is replaced in the ordinary course of business; provided, however, that the
aggregate Fair Market Value of all such equipment disposed of in any Fiscal Year
shall not exceed $10,000,000;

          (c)    the lease or sublease of Real Property or personal property
which does not constitute a sale and leaseback, other than the Permitted Sale
and Leaseback;

          (d)    assignments and licenses of intellectual property of the
Borrower and its Subsidiaries in the ordinary course of business;

          (e)    any sale or disposition of Inventory or Equipment (i) among
Terra Capital and any wholly-owned Domestic Subsidiary of Terra Capital which is
a Terra Capital Guarantor, (ii) among TNCLP, TNLP and any wholly-owned Domestic
Subsidiary of TNCLP which is a Guarantor in respect of the Obligations of TNLP,
(iii) among Terra UK and any wholly-owned Subsidiary of Terra UK (which is
incorporated in England and Wales) which is a Guarantor in respect of the
Obligations of Terra UK, (iv) among the Borrower and any wholly-owned Subsidiary
of the Borrower (which is incorporated in Canada) which is a Guarantor in
respect of the Obligations of the Borrower, (v) by Terra Industries or one of
its wholly-owned

                                       67
<PAGE>

Domestic Subsidiaries to TNCLP or one of its wholly-owned Domestic Subsidiaries
so long as (in the case of this clause (v)) the consideration is paid in cash to
such transferor for all such assets in an amount not less than the Fair Market
Value thereof or (vi) by Terra Industries or its Subsidiaries (except TNCLP or
any of its Subsidiaries) to its Affiliates so long as (in the case of this
clause (vi)) the consideration is paid in cash to such transferor for all such
assets in an amount not less than the Fair Market Value thereof;

          (f)    the Permitted Sale Leaseback Transaction;

          (g)    any other Asset Sales (including any disposition of assets to a
joint venture by Terra Industries or its Subsidiaries) the aggregate Fair Market
Value of which, shall not at any time exceed $5,000,000; and

          (h)    additional Asset Sales by Terra Industries and its Subsidiaries
(other than in respect of (i) property subject to Liens under the Security
Documents and (ii) property subject to Liens securing Indebtedness of Terra
Industries or such Subsidiary) to Terra Industries or any of its Subsidiaries.

          Section 8.5.    Restricted Payments.  Terra Industries will not and it
                          -------------------
will not permit any of its Subsidiaries to, directly or indirectly, declare,
order, pay, make or set apart any sum for any Restricted Payment except:

          (a)    Restricted Payments by any Subsidiary of Terra Capital to Terra
Capital or any Subsidiary of Terra Capital;

          (b)    cash dividends on the Stock of Terra Capital to Terra Capital
Holdings and on the Stock of Terra Capital Holdings to Terra Industries, paid
and declared in any Fiscal Year solely for the purpose of funding the following:

                 (i)    ordinary operating expenses and scheduled debt service
     of Terra Industries (including in respect of the Indentures) not in excess
     of $40,000,000 in any Fiscal Year and payments by Terra Industries of the
     foregoing;

                 (ii)   payments by Terra Industries in respect of foreign,
     federal, state or local taxes owing by Terra Industries in respect of Terra
     Capital and its Subsidiaries, but not greater than the amount that would be
     payable by Terra Capital, on a consolidated basis, if Terra Capital were
     the taxpayer; and

                 (iii)  payments (net of cash in-flows) by Terra Industries to
finance discontinued operations not exceeding $5,000,000 in any Fiscal year;

provided, however, that the Restricted Payments described in clause (b) above
shall not be permitted if either (A) an Event of Default or Default shall have
occurred and be continuing at the date of declaration or payment thereof or
would result therefrom or (B) such Restricted Payment is prohibited under the
terms of any Indebtedness (other than the Obligations) of the Loan Parties or
any of their respective Subsidiaries;

          (c)    TNCLP Minority Interest Payments provided, however, that such
Restricted Payments shall not be permitted if (i) any Intercompany Indebtedness
is outstanding and owing by TNCLP or by TNLP, (ii) an Event of Default or
Default shall have occurred and be

                                       68
<PAGE>

continuing at the date of declaration or payment thereof or would result
therefrom or (iii) such Restricted Payment is prohibited under the terms of any
Indebtedness (other than the Obligations) of the Loan Parties or any of their
respective Subsidiaries;

          (d)    Restricted Payments permitted under Section 8.3(h); and

          (e)    any other Restricted Payment to Terra Industries by any
Subsidiary of Terra Industries.

          Section 8.6.    Restriction on Fundamental Changes.  Except pursuant
                          ----------------------------------
to an Anticipated Corporate Reorganization Transaction, Terra Industries will
not, and will not permit any of its Material Subsidiaries to, (a) merge with any
Person, (b) consolidate with any Person, (c) acquire all or substantially all of
the Stock or Stock Equivalents of any Person, (d) acquire all or substantially
all of the assets of any Person or all or substantially all of the assets
constituting the business of a division, branch or other unit operation of any
Person, (e) except as permitted by Section 8.3(m), enter into any joint venture
or partnership with any Person or (f) acquire or (unless, after giving effect
thereto, Terra Industries and the Obligors are in compliance with Sections 7.11
and 8.3(l)) create any Subsidiary; provided, however, that any Loan Party may
merge or be consolidated with any of its wholly-owned Subsidiaries but only if
(i) such Loan Party is the surviving entity and no Material Adverse Change,
Default or Event of Default would result from such merger or consolidation and
(ii) all parties to such merger or consolidation are incorporated solely in
either the United States (or any state or subdivision thereof), Canada or
England and Wales (as the case may be).

          Section 8.7.    Change in Nature of Business. (a) Terra Industries
                          ----------------------------
will not, and will not permit any of its Subsidiaries to, make any material
change in the nature or conduct of its business as carried on at the date
hereof; (b) each of Terra Industries and Terra Capital Holdings will at no time
own any property other than Investments in its Subsidiaries which are its
Subsidiaries at the date hereof, cash and Cash Equivalents (to the extent
permitted under Section 8.3), other property incidental to its business as a
holding company or necessary to the performance of its obligations under the
Management Agreements, and (c) Terra Industries shall ensure that TNCLP will at
no time own any property other than ownership interests in TNLP, cash and other
property incidental to its business as a holding company.

          Section 8.8.    Transactions with Affiliates.  Terra Industries will
                          ----------------------------
not, and will not permit any of its Subsidiaries to, except as otherwise
expressly permitted herein, do any of the following: (a) make any Investment in
any of its Affiliates which is not its Subsidiary; (b) transfer, sell, lease,
assign or otherwise dispose of any asset to any of its Affiliates which is not
its Subsidiary; (c) merge into or consolidate with or purchase or acquire assets
from any of its Affiliates which is not its Subsidiary; (d) repay any
Indebtedness to any of its Affiliates which is not its Subsidiary; or (e) enter
into any other transaction directly or indirectly with or for the benefit of any
of its Affiliates which is not its Subsidiary (including guarantees and
assumptions of obligations of any such Affiliate), except for (i) transactions
in the ordinary course of business on a basis no less favorable to it as would
be obtained in a comparable arm's length transaction with a Person not an
Affiliate and (ii) salaries and other employee compensation or fees to officers
or directors of Terra Industries or any of its Subsidiaries commensurate with
current compensation levels.

          Section 8.9.    Restrictions on Subsidiary Distributions; No New
                          ------------------------------------------------
Negative Pledge. Other than pursuant to the Loan Documents and any agreements
---------------
governing any purchase

                                       69
<PAGE>

money Indebtedness or Capital Lease Obligations permitted by clause (b), (c), or
(e) of Section 8.1(in which latter case, any prohibition or limitation shall
only be effective against the assets financed thereby) or in connection with an
Asset Sale which is permitted under Section 8.4 (in respect only of the assets
subject thereto) or pursuant to customary anti-assignment provisions contained
in leases or licenses permitted under this Agreement or as otherwise contained,
at the date hereof, in the Indentures, Terra Industries will not, and will not
permit any of its Subsidiaries to, (a) agree to enter into or suffer to exist or
become effective any consensual encumbrance or restriction of any kind on the
ability of such Subsidiary to pay dividends or make any other distribution or
transfer of funds or assets or make loans or advances to or other Investments
in, or pay any Indebtedness owed to, Terra Industries or any other Subsidiary of
Terra Industries or (b) enter into or suffer to exist or become effective any
agreement which prohibits or limits the ability of the Obligors or any
Subsidiary to create, incur, assume or suffer to exist any Lien upon any of its
property, assets or revenues, whether now owned or hereafter acquired, to secure
the Obligations, including any agreement which requires other Indebtedness or
Contractual Obligation to be equally and ratably secured with the Obligations.

          Section 8.10.    Modification of Constituent Documents.  Terra
                           -------------------------------------
Industries will not, and will not permit any of its Subsidiaries to, change its
capital structure (including in the terms of its outstanding Stock) or otherwise
amend its Constituent Documents, except for changes and amendments which (i) do
not materially and adversely affect the rights and privileges of Terra
Industries or any of its Subsidiaries, or the interests of the Administrative
Agent, the Lenders and the Issuers under the Loan Documents or in the Collateral
or (ii) are compulsory under any applicable Requirement of Law or to comply with
the mandatory requirements of any stock exchange on which Terra Industries or
any of its Subsidiaries are listed.

        Section 8.11.      Modification of Material Documents.  Terra Industries
                           ----------------------------------
will not, and will not permit any of its Subsidiaries to, (a) alter, rescind,
terminate, amend, supplement, waive or otherwise modify any provision of any
Material Document (except for modifications which do not materially and
adversely affect the rights and privileges of Terra Industries or any of its
Subsidiaries under such Material Document, or the interests of the Secured
Parties under the Loan Documents or in the Collateral) or (b) permit any
material breach or default to exist under any Material Document or take or fail
to take any action thereunder, without the prior consent of the Requisite
Lenders, which consent shall not be unreasonably withheld.

          Section 8.12.    Subordinated Debt.  Terra Industries will not, and
                           -----------------
will not permit any of its Subsidiaries to purchase, redeem, retire or otherwise
acquire for value, or set apart any money for a sinking, defeasance or other
analogous fund for the purchase, redemption, retirement or other acquisition of,
or make any voluntary payment or prepayment of the principal of or interest on,
or any other amount owing in respect of any Subordinated Debt (other than
Intercompany Indebtedness), in each case except for regularly scheduled payments
of principal and interest in respect thereof required pursuant to the
instruments evidencing such Subordinated Debt, or amend in any manner materially
adverse to the interests of the Lenders and the Issuers the documentation
creating or evidencing such Subordinated Debt.

          Section 8.13.    Accounting Changes; Fiscal Year.  Terra Industries
                           ------------------
will not, and will not permit any of its Subsidiaries to, change its (a)
accounting treatment and reporting practices or tax reporting treatment, except
as required by GAAP or any Requirement of Law and disclosed to the Lenders and
the Administrative Agent or (b) Fiscal Year.

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<PAGE>

          Section 8.14.    Margin Regulations.  The Obligors will not, and will
                           ------------------
not permit any of their Subsidiaries to, use all or any portion of the proceeds
of any credit extended hereunder to purchase or carry Margin Stock.

          Section 8.15.    Operating Leases; Sale/Leasebacks.
                           ---------------------------------

          (a)    Terra Industries will not, and will not permit any of its
Material Subsidiaries to, become or remain liable as lessee or guarantor or
other surety with respect to any operating lease (other than in connection with
the Permitted Sale Leaseback Transaction), unless (i) the aggregate amount of
all rents paid or accrued under all such operating leases shall not exceed
$5,000,000 in any Fiscal Year or (ii) in respect of, or in replacement (upon
substantially equivalent terms) of, operating leases existing at the date of
this Agreement and disclosed in the consolidated financial statements (including
the footnotes thereto) of Terra Industries and its Subsidiaries for the Fiscal
Year ended December 31, 1999.

          (b)    Except for the Permitted Sale Leaseback Transaction, Terra
Industries will not, and will not permit any of its Material Subsidiaries to,
enter into any sale and leaseback transaction.

          Section 8.16.    Cancellation of Indebtedness Owed.  Terra Industries
                           ---------------------------------
will not, and will not permit any of its Subsidiaries to, cancel any claim or
Indebtedness owed to it except (i) in the ordinary course of business consistent
with past practice, (ii) Investments permitted by Section 8.3(d), or (iii) in an
aggregate amount not exceeding $1,000,000.

          Section 8.17.    No Speculative Transactions.  Terra Industries will
                           ---------------------------
not and will not permit any of its Material Subsidiaries to, engage in any
speculative transaction or in any transaction involving Hedging Contracts except
as required by Section 7.14 or for the sole purpose of hedging in the normal
course of business and consistent with industry practices.

          Section 8.18.    Compliance with ERISA and Foreign Plans.  Terra
                           ---------------------------------------
Industries will not, and will not permit any of its Material Subsidiaries to, or
cause or permit any ERISA Affiliate to, cause or permit to occur (a) an event
which could result in the imposition of a Lien under Section 412 of the IRC or
Section 302 or 4068 of ERISA or (b) an ERISA Event that would have a Material
Adverse Effect or (c) breach any Requirement of Law or obligations pertaining to
any Foreign Plan that would have a Material Adverse Effect.

          Section 8.19.    Environmental.  Terra Industries will not, and will
                           -------------
not permit any of its Subsidiaries to, dispose of any Contaminant in violation
of any Environmental Law; provided, however, that the Loan Parties shall not be
deemed in violation of this Section 8.19 if, as the consequence of all such
disposals, such Loan Party could not reasonably be expected to incur
Environmental Liabilities and Costs in excess of $1,000,000.

          Section 8.20.    Payments to Minority Interests.  Terra Industries
                           ------------------------------
shall not pay or cause to be paid, or permit any of its Subsidiaries to pay or
cause to be paid, to any holder of a minority interest any amount (including any
TNCLP Minority Interest Payment) with respect to such minority interest in
excess of the amount to which such holder is legally entitled, unless Terra
Industries or such Subsidiary simultaneously receives payment in an amount equal
to or greater than its ratable share of the amount of the related distribution
(determined in accordance with the respective interests then held by Terra
Industries and such Subsidiary, on the one hand,

                                       71
<PAGE>

and such holder, on the other); provided, however, that the purchase of Common
Units permitted by Section 8.3(h) will not constitute a breach of this Section
8.20.

                                  ARTICLE IX

                    Events of Default and Events of Failure

          Section 9.1.    Events of Default.  Each of the following events shall
                          -----------------
be an Event of Default:

          (a)    The Borrower shall fail to pay any principal of any Advance
when the same becomes due and payable; or

          (b)    The Borrower shall fail to pay any interest on any Advance, any
fee under any of the Loan Documents or any other Obligation (other than one
referred to in clause (a) above) and such non-payment continues for a period of
five Business Days after the due date therefor; or

          (c)    any representation or warranty made or deemed made by any Loan
Party in any Loan Document or by any Loan Party (or any of its officers) in
connection with any Loan Document shall prove to have been incorrect in any
material respect when made or deemed made; or

          (d)    Terra Industries shall fail to pay or perform its obligations
under the Loan Purchase Agreement; or

          (e)    any Loan Party shall fail to perform or observe (i) any term,
covenant or agreement contained in Article V, Sections 6.1(a) through (e) and
(g), 6.2, 7.1, 7.6, 7.11 or 7.12 or Article VIII (except Section 8.19) or (ii)
any other term, covenant or agreement contained in this Agreement or in any
other Loan Document if such failure under this clause (ii) shall remain
unremedied for 30 days after the earlier of the date on which (A) a Responsible
Officer of the Borrower becomes aware of such failure or (B) written notice
thereof shall have been given to the Borrower by the Administrative Agent or any
Lender; or

          (f)    (i) Terra Industries or any of its Subsidiaries shall fail to
make any payment on any Indebtedness (other than the Obligations) of Terra
Industries or any such Subsidiary (or any Guaranty Obligation in respect of
Indebtedness of any other Person) having a principal amount of $10,000,000 or
more, when the same becomes due and payable (whether by scheduled maturity,
required prepayment, acceleration, demand or otherwise); or (ii) any other event
shall occur or condition shall exist under any agreement or instrument relating
to any such Indebtedness, if the effect of such event or condition is to
accelerate, or to permit the acceleration of, the maturity of such Indebtedness;
or (iii) any such Indebtedness shall become or be declared to be due and
payable, or required to be prepaid or repurchased (other than by a regularly
scheduled required prepayment), prior to the stated maturity thereof; or

          (g)    Terra Industries or any of its Material Subsidiaries shall
generally not pay its debts as such debts become due, or shall admit in writing
its inability to pay its debts generally, or shall make a general assignment for
the benefit of creditors, or any proceeding shall be instituted by or against
Terra Industries or any of its Material Subsidiaries seeking to adjudicate it a
bankrupt or insolvent, or seeking liquidation, winding up, reorganization,

                                       72
<PAGE>

arrangement, adjustment, protection, relief or composition of it or its debts or
any similar relief under any law relating to bankruptcy, insolvency or
reorganization or relief of debtors, or seeking the entry of an order for relief
or the appointment of a custodian, receiver, trustee, administrative receiver,
liquidator, provisional liquidator, administrator, custodian or other similar
official for it or for any substantial part of its property and, in the case of
any such proceedings instituted against Terra Industries or any of its Material
Subsidiaries (but not instituted by it), either such proceedings shall remain
undismissed or unstayed for a period of 30 days or any of the actions sought in
such proceedings shall occur; or Terra Industries or any of its Material
Subsidiaries shall take any corporate action to authorize any of the actions set
forth above in this subsection (f); or

          (h)    one or more judgments or orders (or other similar process)
involving, in any single case or in the aggregate, an amount in excess of
$10,000,000 (in the case of a money judgment), or which would have a Material
Adverse Effect (in the case of a non-money judgment) to the extent not covered
by insurance shall be rendered against one or more of Terra Industries and its
Subsidiaries and shall remain unpaid and either (i) enforcement proceedings
shall have been commenced and be continuing by any creditor upon such judgment
or order or (ii) there shall be any period of 30 consecutive days during which a
stay of enforcement of such judgment or order, by reason of a pending appeal or
otherwise, shall not be in effect (unless during such period such judgment or
order shall have been vacated, satisfied, discharged or bonded pending appeal);
or

          (i)    an ERISA Event shall occur or there shall be asserted against
the Borrower or any of its Subsidiaries any claim or liability in respect of any
Foreign Plan which is reasonably likely to have a Material Adverse Effect or the
amount of all liabilities and deficiencies resulting therefrom, whether or not
assessed, exceeds $1,000,000 in the aggregate; or

          (j)    any material provision (as determined by the Administrative
Agent) of any Collateral Document or any Guaranty after delivery thereof
pursuant to this Agreement or any other Loan Document shall for any reason cease
to be valid and binding, or enforceable against, on any Loan Party thereto, or
any Loan Party shall so state in writing; or

          (k)    any Collateral Document shall for any reason cease to create a
valid Lien on any of the Collateral purported to be covered thereby or except as
permitted by the Loan Documents, such Lien shall cease to be a perfected and
first priority Lien or any Loan Party shall so state in writing; or

          (l)    there shall occur any Change of Control; or

          (m)    there shall have been asserted (in any action, suit, proceeding
or investigation) against Terra Industries or any of its Subsidiaries any
violation or liability under any Environmental Law that, in the judgment of the
Requisite Lenders, is reasonably likely to be determined adversely to Terra
Industries or any of its Subsidiaries, and (either individually or in the
aggregate) is reasonably likely to have a Material Adverse Effect (after taking
into account any contribution in respect thereof that is reasonably expected to
be paid by other creditworthy Persons); or

          (n)    one or more of Terra Industries and its Subsidiaries shall have
entered into one or more consent or settlement decrees or agreements or similar
arrangements with a Governmental Authority or one or more judgments, orders,
decrees or similar actions shall have

                                       73
<PAGE>

been entered against one or more of Terra Industries and its Subsidiaries based
on or arising from the violation of or pursuant to any Environmental Law, or the
generation, storage, transportation, treatment, disposal or Release of any
Contaminant and, in connection with all the foregoing, Terra Industries and its
Subsidiaries are likely to incur Environmental Liabilities and Costs in excess
of $1,000,000 in the aggregate (unless the foregoing is reasonably being
appealed by Terra Industries or its Subsidiaries and has been bonded pending
appeal); or

          (o)    any Event of Default (as defined in the Revolving and Term
Credit Agreement) shall have occurred and be continuing; or

          (p)    An Event of Failure has occurred and remains uncured for a
period of five (5) consecutive Business Days.

          Section 9.2.    Remedies.  During the continuance of any Event of
                          --------
Default, the Administrative Agent may, and shall at the request of the Requisite
Lenders, by notice to the Borrower declare the Advances, all interest thereon
and all other amounts and Obligations payable under this Agreement to be
forthwith due and payable, whereupon the Advances, all such interest and all
such amounts and Obligations shall become and be forthwith due and payable,
without presentment, demand, protest or further notice of any kind, all of which
are hereby expressly waived by the Borrower; provided, however, that upon the
occurrence of the Event of Default specified in Section 9.1(g) above (except to
the extent that such Event of Default has occurred in respect of Terra
Industries and/or Terra Capital Holdings) or upon acceleration of the
Obligations under the Revolving and Term Credit Facility, the Advances, all such
interest and all such amounts and Obligations shall automatically become and be
due and payable, without presentment, demand, protest or any notice of any kind,
all of which are hereby expressly waived by the Borrower. In addition to the
remedies set forth above, the Administrative Agent may instruct the Collateral
Agent, on behalf of the Secured Parties, to exercise any remedies provided for
by the Collateral Documents in accordance with the terms thereof or any other
remedies provided by applicable law.

          Section 9.3.    Rescission.  If at any time after acceleration of the
                          ----------
maturity of the Advances, the Borrower shall pay all arrears of interest and all
payments on account of principal of the Advances which shall have become due
otherwise than by acceleration (with interest on principal and, to the extent
permitted by law, on overdue interest, at the rates specified herein) and all
Events of Default and Defaults (other than non-payment of principal of and
accrued interest on the Advances due and payable solely by virtue of
acceleration) shall be remedied or waived pursuant to Section 11.1, then upon
the written consent of the Requisite Lenders and written notice to the Borrower,
the acceleration and its consequences may be rescinded and annulled; but such
action shall not affect any subsequent Event of Default or Default or impair any
right or remedy consequent thereon. The provisions of the preceding sentence are
intended merely to bind the Lenders to a decision which may be made at the
election of the Requisite Lenders; they are not intended to benefit the Borrower
and do not give the Borrower the right to require the Lenders to rescind or
annul any acceleration hereunder, even if the conditions set forth herein are
met.

          Section 9.4.    Events of Failure.  If Terra Industries or any of its
                          -----------------
Subsidiaries (a) receives Net Cash Proceeds in excess of $5,000,000 as a result
of (i) an Asset Sale, (ii) a Debt Issuance, or (iii) an insured loss or casualty
event, other than proceeds in respect of business interruption, and (b) (x)
fails, within five Business Days thereof, to cause 100% of such Net Cash
Proceeds arising therefrom to be applied in accordance with Section 2.9 of the
Revolving and Term Credit Agreement or (y) following application of such Net
Cash Proceeds in accordance with Section 2.9 of the Revolving and

                                       74
<PAGE>

Term Credit Agreement, there is a portion of such Net Cash Proceeds remaining,
then such circumstances will constitute an event of failure under this Agreement
(each an "Event of Failure"); provided, however, that in the case of clause
(b)(y), if the Borrower applies such remaining portion in full in prepayment of
the Advances under Section 2.4 of this Agreement, the Event of Failure shall be
cured.

                                   ARTICLE X

                                 The Guarantee

          Section 10.1.    The Guarantee.  The Guarantors hereby jointly and
                           -------------
severally guarantee to each Lender, the Administrative Agent, the Collateral
Agent and their respective successors and assigns the prompt payment in full
when due (whether at stated maturity, by acceleration or otherwise) of the
principal of and interest on the Advances made by the Lenders to, and the Notes
held by each Lender of, the Borrower and all other Obligations from time to time
owing to the Lenders or the Administrative Agent or any other person by the
Borrower under this Agreement, the Notes and any of the other Loan Documents, in
each case strictly in accordance with the terms thereof (such obligations being
herein collectively called the "Guaranteed Obligations"). The Guarantors hereby
further jointly and severally agree that if the Borrower shall fail to pay in
full when due (whether at stated maturity, by acceleration or otherwise) any of
the Guaranteed Obligations, the Guarantors will promptly pay the same, without
any demand or notice whatsoever, and that in the case of any extension of time
of payment or renewal of any of the Guaranteed Obligations, the same will be
promptly paid in full when due (whether at extended maturity, by acceleration or
otherwise) in accordance with the terms of such extension or renewal.

          Section 10.2.    Obligations Unconditional.
                           -------------------------

          (a)    The obligations of the Guarantors under Section 10.1 are
absolute and unconditional, joint and several, irrespective of the value,
genuineness, validity, regularity or enforceability of the obligations of the
Borrower under this Agreement, the Notes or any other agreement or instrument
referred to herein or therein, or any substitution, release or exchange of any
other guarantee of or security for any of the Guaranteed Obligations, and, to
the fullest extent permitted by applicable law, irrespective of any other
circumstance whatsoever that might otherwise constitute a legal or equitable
discharge or defense of a surety or guarantor, it being the intent of this
Section 10.2 that the obligations of the Guarantors hereunder shall be absolute
and unconditional, joint and several, under any and all circumstances.

          (b)    Without limiting the generality of the foregoing clause (a), it
is agreed that the occurrence of any one or more of the following shall not
alter or impair the liability of the Guarantors hereunder which shall remain
absolute and unconditional as described above:

                 (i)    at any time or from time to time, without notice to the
     Guarantors, the time for any performance of or compliance with any of the
     Guaranteed Obligations shall be extended, or such performance or compliance
     shall be waived;

                 (ii)   any of the acts mentioned in any of the provisions of
     this Agreement or the Notes or any other agreement or instrument referred
     to herein or therein shall be done or omitted;

                                       75
<PAGE>

                (iii)  the maturity of any of the Guaranteed Obligations shall
     be accelerated, or any of the Guaranteed Obligations shall be modified,
     supplemented or amended in any respect, or any right under this Agreement
     or the Notes or any other agreement or instrument referred to herein or
     therein shall be waived or any other guarantee of any of the Guaranteed
     Obligations or any security therefor shall be released or exchanged in
     whole or in part or otherwise dealt with; or

                (iv) any lien or security interest granted to, or in favor of,
     the Administrative Agent or any Lender as security for any of the
     Guaranteed Obligations shall fail to be perfected.

The Guarantors hereby expressly waive diligence, presentment, demand of payment,
protest and all notices whatsoever, and any requirement that the Administrative
Agent or any Lender exhaust any right, power or remedy or proceed against the
Borrower under this Agreement or the Notes or any other agreement or instrument
referred to herein or therein, or against any other Person under any other
guarantee of, or security for, any of the Guaranteed Obligations.

          Section 10.3.    Reinstatement.  The obligations of the Guarantors
                           -------------
under this Article X shall be automatically reinstated if and to the extent that
for any reason any payment by or on behalf of the Borrower in respect of the
Guaranteed Obligations is rescinded or must be otherwise restored by any holder
of any of the Guaranteed Obligations, whether as a result of any proceedings in
bankruptcy or reorganization or otherwise, and the Guarantors jointly and
severally agree that they will indemnify the Administrative Agent and each
Lender on demand for all reasonable costs and expenses (including, without
limitation, fees of counsel) incurred by the Administrative Agent or such Lender
in connection with such rescission or restoration, including any such costs and
expenses incurred in defending against any claim alleging that such payment
constituted a preference, fraudulent transfer or similar payment under any
bankruptcy, insolvency or similar law.

          Section 10.4.    Subrogation.  Until the Guaranteed Obligations have
                           -----------
been irrevocably paid in full and the Revolving Credit Commitments have been
terminated, the Guarantors shall not enforce or otherwise exercise any right of
subrogation to any of the rights of the Lenders or the Administrative Agent or
any part of them against the Borrower or any right of reimbursement or
contribution or similar right against the Borrower by reason of this Agreement
or by any payment made by any Guarantor in respect of the Guarantied
Obligations.

          Section 10.5.    Remedies.  The Guarantors jointly and severally
                           --------
agree that, as between the Guarantors and the Lenders, the obligations of the
Borrower under this Agreement and the Notes may be declared to be forthwith due
and payable as provided in Article IX (and shall be deemed to have become
automatically due and payable in the circumstances provided in said Article IX)
for purposes of Section 10.1 notwithstanding any stay, injunction or other
prohibition preventing such declaration (or such obligations from becoming
automatically due and payable) as against the Borrower and that, in the event of
such declaration (or such obligations being deemed to have become automatically
due and payable), such obligations (whether or not due and payable by the
Borrower) shall forthwith become due and payable by the Guarantors for purposes
of Section 10.1.

          Section 10.6.    Instrument for the Payment of Money.  Each Guarantor
                           -----------------------------------
hereby acknowledges that the guarantee in this Article X constitutes an
instrument for the payment of money, and consents and agrees that any Lender or
the Administrative Agent, at its

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<PAGE>

sole option, in the event of a dispute by such Guarantor in the payment of any
moneys due hereunder, shall have the right to bring motion-action under New York
CPLR Section 3213.

          Section 10.7.    Continuing Guarantee.  The guarantee in this
                           --------------------
Article X is a continuing guarantee, and shall apply to all Guaranteed
Obligations whenever arising.

          Section 10.8.    Rights of Contribution.  Provided that all actual and
                           ----------------------
contingent Obligations of the Loan Parties have been irrevocably paid in full
and the Revolving Credit Commitments are no longer outstanding, the Guarantors
hereby agree, as between themselves, that if any Subsidiary Guarantor shall
become an Excess Funding Guarantor (as defined below) by reason of the payment
by such Subsidiary Guarantor of any Guaranteed Obligations, each other
Subsidiary Guarantor shall, on demand of such Excess Funding Guarantor (but
subject to the next sentence), pay to such Excess Funding Guarantor an amount
equal to such Subsidiary Guarantor's Pro Rata Portion (as defined below and
determined, for this purpose, without reference to the properties, debts and
liabilities of such Excess Funding Guarantor) of the Excess Payment (as defined
below) in respect of such Guaranteed Obligations.  The payment obligation of a
Subsidiary Guarantor to any Excess Funding Guarantor under this Section 10.8
shall be subordinate and subject in right of payment to the prior payment in
full of the obligations of such Subsidiary Guarantor under the other provisions
of this Article X and such Excess Funding Guarantor shall not exercise any right
or remedy with respect to such excess until payment and satisfaction in full of
all of such obligations.

          For purposes of this Section 10.8, (i) "Excess Funding Guarantor"
shall mean, in respect of any Guaranteed Obligations, a Subsidiary Guarantor
that has paid an amount in excess of its Pro Rata Portion of such Guaranteed
Obligations, (ii) "Excess Payment" shall mean, in respect of any Guaranteed
Obligations, the amount paid by an Excess Funding Guarantor in excess of its Pro
Rata Portion of such Guaranteed Obligations and (iii) "Pro Rata Portion" shall
mean, for any Subsidiary Guarantor, the ratio (expressed as a percentage) of (x)
the amount by which the aggregate present fair saleable value of all properties
of such Subsidiary Guarantor (excluding any shares of stock of any other
Subsidiary Guarantor) exceeds the amount of all the debts and liabilities of
such Subsidiary Guarantor (including contingent, subordinated, unmatured and
unliquidated liabilities, but excluding the obligations of such Subsidiary
Guarantor hereunder and any obligations of any other Subsidiary Guarantor that
have been Guaranteed by such Subsidiary Guarantor) to (y) the amount by which
the aggregate fair saleable value of all properties of the Company and all of
the Subsidiary Guarantors exceeds the amount of all the debts and liabilities
(including contingent, subordinated, unmatured and unliquidated liabilities, but
excluding the obligations of the Company and the Subsidiary Guarantors
hereunder) of the Company and all of the Subsidiary Guarantors, all as of the
Restatement Date.  If any Subsidiary becomes a Subsidiary Guarantor hereunder
subsequent to the Restatement Date, then for purposes of this Section 10.8 such
subsequent Subsidiary Guarantor shall be deemed to have been a Subsidiary
Guarantor as of the Restatement Date and the aggregate present fair saleable
value of the properties, and the amount of the debts and liabilities, of such
Subsidiary Guarantor as of the Restatement Date shall be deemed to be equal to
such value and amount on the date such Subsidiary Guarantor becomes a Subsidiary
Guarantor hereunder.

          Section 10.9.    General Limitation on Guarantee Obligations.  In
                           -------------------------------------------
any action or proceeding involving any state corporate law, or any state or
Federal bankruptcy, insolvency, reorganization or other law affecting the rights
of creditors generally, if the obligations of any Guarantor under Section 10.1
would otherwise, taking into account the provisions of Section 10.8, be held or
determined to be void, invalid or unenforceable, or subordinated to the claims
of any

                                       77
<PAGE>

other creditors, on account of the amount of its liability under said
Section 10.1, then, notwithstanding any other provision hereof to the contrary,
the amount of such liability shall, without any further action by such
Guarantor, any Lender, the Administrative Agent or any other Person, be
automatically limited and reduced to the highest amount that is valid and
enforceable and not subordinated to the claims of other creditors as determined
in such action or proceeding

                                  ARTICLE XI

                            The Administrative Agent

          Section 11.1.    Authorization and Action.
                           ------------------------
          (a)    Each Lender hereby appoints Citibank as the Administrative
Agent hereunder and each Lender authorizes the Administrative Agent to take such
action as agent on its behalf and to exercise such powers under this Agreement
and the other Loan Documents as are delegated to the Administrative Agent under
such agreements and to exercise such powers as are reasonably incidental
thereto. Without limitation of the foregoing, each Lender hereby authorizes the
Administrative Agent to execute and deliver, and to perform its obligations
under, each of the Loan Documents to which the Administrative Agent is a party
and to exercise all rights, powers and remedies that the Administrative Agent
may have under such Loan Documents and that under the Collateral Documents the
Administrative Agent is acting as agent for the Lenders and the other Secured
Parties.

          (b)    As to any matters not expressly provided for by this
Agreement, the Intercreditor Agreement and the other Loan Documents (including
enforcement or collection), the Administrative Agent shall not be required to
exercise any discretion or take any action, but shall be required to act or to
refrain from acting (and shall be fully protected in so acting or refraining
from acting) upon the instructions of the Requisite Lenders, and such
instructions shall be binding upon all Lenders; provided, however, that the
Administrative Agent shall not be required to take any action which (i) the
Administrative Agent in good faith believes exposes it to personal liability
unless the Administrative Agent receives an indemnification satisfactory to it
from the Lenders with respect to such action or (ii) is contrary to this
Agreement or applicable law. The Administrative Agent agrees to give to each
Lender prompt notice of each notice given to it by any Loan Party pursuant to
the terms of this Agreement or the other Loan Documents.

          (c)    In performing its functions and duties hereunder and under the
other Loan Documents, the Administrative Agent is acting solely on behalf of the
Lenders and its duties are entirely administrative in nature. The Administrative
Agent does not assume and shall not be deemed to have assumed any obligation
other than as expressly set forth herein and in the other Loan Documents or any
other relationship as the agent, fiduciary or trustee of or for any Lender,
Issuer or holder of any other Obligation. The Administrative Agent may perform
any of its duties under any of the Loan Documents by or through its agents or
employees.

          Section 11.2.    Administrative Agent's Reliance, Etc.  Neither the
                           ------------------------------------
Administrative Agent nor any of its Affiliates or any of the respective
directors, officers, agents or employees of the Administrative Agent or any such
Affiliate shall be liable for any action taken or omitted to be taken by it,
him, her or them under or in connection with this Agreement or the other Loan
Documents, except for its, his, her or their own gross negligence or willful
misconduct.  Without limiting the foregoing, the Administrative Agent (a) may
treat the payee of any Note as its holder until such Note has been assigned in
accordance with Section 12.2; (b) may

                                       78
<PAGE>

rely on the Register to the extent set forth in Section 12.2(c); (c) may consult
with legal counsel (including counsel to the Borrower or any other Loan Party),
independent public accountants and other experts selected by it and shall not be
liable for any action taken or omitted to be taken in good faith by it in
accordance with the advice of such counsel, accountants or experts; (d) makes no
warranty or representation to any Lender and shall not be responsible to any
Lender for any statements, warranties or representations made by or on behalf of
Terra Industries or any of its Subsidiaries in or in connection with this
Agreement or any of the other Loan Documents; (e) shall not have any duty to
ascertain or to inquire either as to the performance or observance of any of the
terms, covenants or conditions of this Agreement or any of the other Loan
Documents or the financial condition of any Loan Party, or the existence or
possible existence of any Default or Event of Default; (f) shall not be
responsible to any Lender for the due execution, legality, validity,
enforceability, genuineness, sufficiency or value of this Agreement or any of
the other Loan Documents or any other instrument or document furnished pursuant
hereto or thereto; and (g) shall incur no liability under or in respect of this
Agreement or any of the other Loan Documents by acting upon any notice, consent,
certificate or other instrument or writing (which may be by telecopy) or any
telephone message believed by it to be genuine and signed or sent by the proper
party or parties.

          Section 11.3.    The Administrative Agent Individually.  With respect
                           -------------------------------------
to its Ratable Portion, Citibank shall have and may exercise the same rights and
powers hereunder and is subject to the same obligations and liabilities as and
to the extent set forth herein for any other Lender. The terms "Lenders",
"Required Lenders", "Requisite Lenders," "Requisite Current Asset Lenders," or
"Requisite Fixed Asset Lenders" or any similar terms shall, unless the context
clearly otherwise indicates, include the Administrative Agent in its individual
capacity as a Lender or as one of such class of Lenders. Citibank and its
Affiliates may accept deposits from, lend money to, and generally engage in any
kind of banking, trust or other business with any Loan Party as if it were not
acting as the Administrative Agent. The term "Lenders" where used in this
Article XI and Article XII shall include the Lenders hereunder and the Lenders
as defined in the Revolving and Term Credit Agreement.

          Section 11.4.    Lender Credit Decision.  Each Lender acknowledges
                           ----------------------
that it shall, independently and without reliance upon the Administrative Agent
or its Affiliates or any other Lender conduct its own independent investigation
of the financial condition and affairs of the Borrower and each other Loan Party
in connection with the making, assignment and continuance of the Advances. Each
Lender also acknowledges that it will, independently and without reliance upon
the Administrative Agent or its Affiliates or any other Lender and based on such
documents and information as it shall deem appropriate at the time, continue to
make its own credit decisions in taking or not taking action under this
Agreement and the other Loan Documents.

          Section 11.5.    Indemnification.  Each Lender agrees to indemnify the
                           ---------------
Administrative Agent and each of its Affiliates, and each of their respective
directors, officers, employees, agents and advisors (to the extent not
reimbursed by the Borrower), from and against such Lender's aggregate Pro Rata
Share of any and all liabilities, obligations, losses, damages, penalties,
actions, judgments, suits, costs, expenses and disbursements (including fees and
disbursements of legal counsel) of any kind or nature whatsoever which may be
imposed on, incurred by, or asserted against, the Administrative Agent or any of
its Affiliates, directors, officers, employees, agents and advisors in any way
relating to or arising out of this Agreement or the other Loan Documents or any
action taken or omitted by the Administrative Agent under this

                                       79
<PAGE>

Agreement or the other Loan Documents; provided, however, that no Lender shall
be liable for any portion of such liabilities, obligations, losses, damages,
penalties, actions, judgments, suits, costs, expenses or disbursements resulting
from the Administrative Agent's or such Affiliate's gross negligence or willful
misconduct. Without limitation of the foregoing, each Lender agrees to reimburse
the Administrative Agent promptly upon demand for its ratable share of any out-
of-pocket expenses (including fees and disbursements of legal counsel) incurred
by the Administrative Agent in connection with the preparation, execution,
delivery, administration, modification, amendment or enforcement (whether
through negotiations, legal proceedings or otherwise) of, or legal advice in
respect of its rights or responsibilities under, this Agreement or the other
Loan Documents, to the extent that the Administrative Agent is not reimbursed
for such expenses by the Borrower or another Loan Party.

          Section 11.6.    Successor and Co-Administrative Agents.  (a) Subject
                           --------------------------------------
to clause (b) below, the Administrative Agent may resign at any time by giving
written notice thereof to the Lenders and the Borrower. Upon any such
resignation, the Requisite Lenders shall have the right to appoint a successor
Administrative Agent. If no successor Administrative Agent shall have been so
appointed by the Requisite Lenders, and shall have accepted such appointment,
within 30 days after the retiring Administrative Agent's giving of notice of
resignation, then the retiring Administrative Agent may, on behalf of the
Lenders, appoint a successor Administrative Agent selected from among the
Lenders. Each such appointment shall be subject to the prior written approval of
the Borrower (which approval may not be unreasonably withheld and shall not be
required upon the occurrence and during the continuance of an Event of Default);
(b) Notwithstanding clause (a) above, the Administrative Agent may at any time
appoint any Affiliate (or Affiliates) of the Administrative Agent each as (i) a
successor Administrative Agent in the event that the Administrative Agent wishes
to retire as Administrative Agent or (ii) (in connection with the performance
and exercise of its rights and obligations under the Loan Documents) as co-
Administrative Agent, which appointment and (if relevant) resignation shall be
effective upon the Administrative Agent giving written notice thereof to the
Lenders and the Borrowers. Any such appointment and/or resignation under this
clause (b) shall not require the consent of any Lender or Borrower. (c) Upon the
acceptance of any appointment as Administrative Agent by a successor
Administrative Agent or co-Administrative Agent pursuant to clauses (a) or (b)
above, each such successor Administrative Agent shall succeed to, and each such
co-Administrative Agent shall accede to, and become vested with all the rights,
powers, privileges and duties of the retiring or remaining Administrative Agent,
and in the case of a retiring Administrative Agent, such Administrative Agent
shall be discharged from its duties and obligations under this Agreement and the
other Loan Documents. After any retiring Administrative Agent's resignation
hereunder as Administrative Agent, the retiring Administrative Agent shall
continue to have the benefit of this Article XI as to any actions taken or
omitted to be taken by it while it was Administrative Agent under this Agreement
and the other Loan Documents.

          Section 11.7.    Concerning the Collateral and the Collateral
                           --------------------------------------------
Documents. (a)    Each Lender agrees that (subject to the provisions of the
---------
Intercreditor Agreement) any action taken by the Administrative Agent or the
Requisite Lenders (or, where required by the express terms of this Agreement or
the Intercreditor Agreement, a greater or different proportion or combination of
the Lenders) in accordance with the provisions of this Agreement or of the other
Loan Documents, and the exercise by the Administrative Agent or the Requisite
Lenders (or, where so required, such greater or different proportion or
combination) of

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the powers set forth herein or therein, together with such other powers as are
reasonably incidental thereto, shall be authorized and binding upon all of the
Lenders and other Secured Parties. Without limiting the generality of the
foregoing, the Administrative Agent shall have the sole and exclusive right and
authority to (i) act as the disbursing and collecting agent for the Lenders with
respect to all payments and collections arising in connection herewith and with
the Collateral Documents; (ii) execute and deliver the Intercreditor Agreement
and each Loan Document and accept delivery of each such agreement delivered by
Terra Industries or any of its Subsidiaries; (iii) appoint Citibank as
Collateral Agent under the Intercreditor Agreement to act as collateral agent
for the Lenders and the other Secured Parties for purposes of executing and
delivering each Collateral Document and the perfection of all security interests
and Liens created by such agreements and all other purposes stated therein;
provided, however, the Administrative Agent hereby appoints, authorizes and
directs each Lender to act as collateral sub-agent for the Administrative Agent
and the Lenders for purposes of the perfection of all security interests and
Liens with respect to Terra Industries' and its Subsidiaries' respective deposit
accounts maintained with, and cash and Cash Equivalents held by, such Lender;
(iv) except as provided in the Intercreditor Agreement with respect to the
Collateral Agent manage, supervise and otherwise deal with the Collateral; (v)
take such action as is necessary or desirable to maintain the perfection and
priority of the security interests and Liens created or purported to be created
by the Collateral Documents; and (vi) except as may be otherwise specifically
restricted by the terms hereof or of the Intercreditor Agreement or of any other
Loan Document, exercise all remedies given to the Administrative Agent, the
Lenders and the other Secured Parties and direct the Collateral Agent in
accordance with the terms hereof and of the Intercreditor Agreement with respect
to the Collateral under the Loan Documents relating thereto, applicable law or
otherwise.

          (b)    Each of the Lenders hereby directs, in accordance with the
terms hereof, the Administrative Agent to release or to instruct the Collateral
Agent to release (or, in the case of clause (ii) below, release or subordinate)
any Lien held by the Collateral Agent for the benefit of the Lenders:

                 (i)    against all of the Collateral, upon termination of the
          Commitments and payment and satisfaction in full of all Advances and
          all other Obligations which have matured and which the Administrative
          Agent has been notified in writing are then due and payable;

                 (ii)   against any assets that are subject to a Lien permitted
          by Section 8.2(d), (e) or (g);

                 (iii)  against any part of the Collateral sold or disposed of
          by a Loan Party if such sale or disposition is permitted by this
          Agreement (or permitted pursuant to a waiver or consent of a
          transaction otherwise prohibited by this Agreement) or, if not
          pursuant to such sale or disposition, if such release is consented to
          by all the Lenders; and

                 (iv)   against any cash collateral to the extent permitted
          under Section 7.12.

Each of the Lenders hereby directs the Administrative Agent to instruct the
Collateral Agent to execute and deliver or file such termination and partial
release statements and do such other things as are necessary to release Liens to
be released pursuant to this Section 11.7 promptly upon the effectiveness of any
such release.

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<PAGE>

          Section 11.8.    Collateral Matters Relating to Related Obligations.
                           --------------------------------------------------
The benefit of the Loan Documents and of the provisions of this Agreement
relating to the Collateral shall extend to and be available in respect of any
Obligation which arises under any Hedging Contract or which is otherwise owed to
Persons other than the Administrative Agent and the Lenders (collectively,
"Related Obligations") solely on the condition and understanding, as among the
Administrative Agent and all Secured Parties, that (i) the Related Obligations
shall be entitled to the benefit of the Loan Documents and the Collateral to the
extent expressly set forth in this Agreement and the other Loan Documents and to
such extent the Administrative Agent shall hold, and have the right and power to
act with respect to, the Guaranty and the Collateral on behalf of and as agent
for the holders of the Related Obligations but the Administrative Agent is
otherwise acting solely as agent for the Lenders and the Issuers and shall have
no fiduciary duty, duty of loyalty, duty of care, duty of disclosure or other
obligation whatsoever to any holder of Related Obligations; (ii) all matters,
acts and omissions relating in any manner to the Guaranty, the Collateral, or
the omission, creation, perfection, priority, abandonment or release of any
Lien, shall be governed solely by the provisions of this Agreement, the
Intercreditor Agreement and the other Loan Documents and no separate Lien,
right, power or remedy shall arise or exist in favor of any Secured Party under
any separate instrument or agreement or in respect of any Related Obligation;
and (iii) each Secured Party shall be bound by all actions taken or omitted, in
accordance with the provisions of this Agreement, the Intercreditor Agreement
and the other Loan Documents, by the Administrative Agent and the Requisite
Lenders (or, where required by the express terms of this Agreement or the
Intercreditor Agreement, a greater or different proportion or combination of the
Lenders), each of whom shall be entitled to act at its sole discretion and
exclusively in its own interest given its own Commitments and its own interest
in the Advances and other Obligations to it arising under this Agreement or the
other Loan Documents, without any duty or liability to any other Secured Party
or as to any Related Obligation and without regard to whether any Related
Obligation remains outstanding or is deprived of the benefit of the Collateral
or becomes unsecured or is otherwise affected or put in jeopardy thereby; and
(iv) no holder of Related Obligations and no other Secured Party (except the
Administrative Agent and the Lenders, to the extent set forth in this Agreement)
shall have any right to be notified of, or to direct, require or be heard with
respect to, any action taken or omitted in respect of the Collateral or under
this Agreement or the Loan Documents; and (v) no holder of any Related
Obligation shall exercise any right of setoff, banker's lien or similar right
except as expressly provided in Section 12.6

          Section 11.9.    Other Agents.  Each party acknowledges that the
                           ------------
Person (except in its capacity as a Lender) designated as "Documentation Agent"
and the Arranger shall in each case have no liability hereunder. In the event
that the Person identified as "Documentation Agent" shall not become a Lender
within 30 days of the Closing Date, such Person shall cease to be the
Documentation Agent and its title as such shall be removed from the cover of
this Agreement.

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                                  ARTICLE XII

                                 Miscellaneous

          Section 12.1.    Amendments, Waivers, Etc.
                           ------------------------
          (a)    No amendment or waiver of any provision of this Agreement or
any other Loan Document nor consent to any departure by any Loan Party therefrom
shall in any event be effective unless the same shall be in writing and signed
by the Requisite Lenders, and then any such waiver or consent shall be effective
only in the specific instance and for the specific purpose for which given;
provided, however, that no amendment, waiver or consent shall, unless in writing
and signed by the relevant Lenders referred to below, in addition to (except as
provided in clause (ix) below) the Requisite Lenders, do any of the following:

                 (i)    waive any of the conditions specified in Article III
     (with consent of each Lender) except with respect to a condition based upon
     another provision hereof, the waiver of which requires only the concurrence
     of the Requisite Lenders;

                 (ii)   subject any Lender to any additional obligations
     (without the consent of each such Lender);

                 (iii)  extend the scheduled final maturity of the Advances,
     or waive, reduce or postpone any scheduled date fixed for the payment or
     reduction of principal (without the consent of each Lender directly
     affected thereby);

                 (iv)   reduce the principal amount of any Advance (other than
     by the payment or prepayment thereof without the consent of each Lender
     directly affected thereby);

                 (v)    reduce the rate of interest on any Advance or any fee
     payable hereunder (without the consent of each Lender directly affected
     thereby);

                 (vi)   postpone any scheduled date fixed for payment of such
     interest or fees (without the consent of each Lender directly affected
     thereby);

                 (vii)  change the Pro Rata Share of the Lenders or the number
     or percentage of Lenders which shall be required for the Lenders or any of
     them to take any action hereunder (without the consent of each Lender,
     other than the Guaranteed Fixed Asset Lender);

                 (viii) (without limiting Section 7.12) release a substantial
     portion of Collateral except as provided in Section 11.7(b) or release any
     Guarantor from its obligations under its Guaranty except in connection with
     sale or other disposition permitted by this Agreement (or permitted
     pursuant to a waiver or consent of a transaction otherwise prohibited by
     this Agreement without the consent of each Lender (other than the
     Guaranteed Fixed Asset Lender)); or

                 (ix)   consent to any Asset Sale not expressly permitted under
     this Agreement (x) where such Asset Sale is in respect of Current Assets,
     without the consent of the Requisite Current Asset Lenders only and (y)
     where such Asset Sale is in respect

                                       83
<PAGE>

     of Fixed Assets, without the consent of the Requisite Fixed Asset Lenders
     only (provided, however, that any Asset Sale which would result in the Term
     Loans being repaid in full shall only require the consent of the Requisite
     Lenders);

                 (x)    amend Section 11.7(b) or this Section 12.1 or the
     definition of the terms "Required Lenders," "Requisite Lenders," "Requisite
     Current Asset Lenders," "Requisite Fixed Asset Lenders" or "Pro Rata Share"
     without the consent of each Lender affected thereby;

and provided, further, (A) that any modification of the application of payments
to the Advances pursuant to Section 2.8 or the Intercreditor Agreement shall
require the consent of the Requisite Current Asset Lenders and (B) that no
amendment, waiver or consent shall, unless in writing and signed by the
Administrative Agent in addition to the Lenders required above to take such
action, affect the rights or duties of the Administrative Agent under this
Agreement or the other Loan Documents.

          (b)    The Administrative Agent may, but shall have no obligation to,
with the written concurrence of any Lender, execute amendments, modifications,
waivers or consents on behalf of that Lender. Any waiver or consent shall be
effective only in the specific instance and for the specific purpose for which
it was given. No notice to or demand on any Obligor in any case shall entitle
any Obligor to any other or further notice or demand in similar or other
circumstances.

          (c)    In connection with any proposed amendment, modification,
waiver or termination (a "Proposed Change") requiring the consent of Lenders in
addition to the Requisite Lenders, the consent of Requisite Lenders is obtained,
but the consent of other Lenders whose consent is required is not obtained (any
such Lender whose consent is not obtained as described in this Section 12.1
being referred to as a "Non-Consenting Lender"), then, so long as the Lender
that is acting as the Administrative Agent is not a Non-Consenting Lender, at
the Borrower's request, the Administrative Agent or an Eligible Assignee that is
acceptable to the Administrative Agent shall have the right with the
Administrative Agent's consent and in the Administrative Agent's sole discretion
(but shall have no obligation) to purchase from such Non-Consenting Lender, and
such Non-Consenting Lender agrees that it shall, upon the Administrative Agent's
request, sell and assign to the Lender that is acting as the Administrative
Agent or such Eligible Assignee, all of the Advances of such Non-Consenting
Lender for an amount equal to the principal balance of all Advances held by the
Non-Consenting Lender and all accrued interest and fees with respect thereto
through the date of sale, such purchase and sale to be consummated pursuant to
an executed Assignment and Acceptance.

          Section 12.2.    Assignments and Participations.
                           ------------------------------

          (a)    Each Lender may sell, transfer, negotiate or assign to one or
more Eligible Assignees all or a portion of its rights and obligations hereunder
(including all of its rights and obligations with respect to the Advances;
provided, however, that (i) the aggregate amount being assigned pursuant to each
such assignment (determined as of the date of the Assignment and Acceptance with
respect to such assignment) shall in no event (if less than the Assignor's
entire interest) be less than (in an aggregate amount of the Advances and the
Revolving Credit Outstandings (and/or Revolving Credit Commitments, as the case
may be) $5,000,000 or an integral multiple of $1,000,000 in excess thereof,
except, in either case, (A) with the consent of the Borrower and the
Administrative Agent or (B) if such assignment is being

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<PAGE>

made to a Lender or an Affiliate or Approved Fund of such Lender, and (iii) if
such Eligible Assignee is not, prior to the date of such assignment, a Lender or
an Affiliate or Approved Fund of a Lender, such assignment shall be subject to
the prior consent of the Administrative Agent and the Borrower (which consent
shall not be unreasonably withheld); provided, however, that, notwithstanding
any other provision of this Section 12.2, the consent of the Borrower shall not
be required for any assignment which occurs when any Event of Default shall have
occurred and be continuing. Any such assignment shall be ratable as between the
Advances and the Revolving Credit Facility under the Revolving and Term Credit
Agreement.

          (b)    The parties to each assignment shall execute and deliver to the
Administrative Agent, for its acceptance and recording, an Assignment and
Acceptance, together with any Note (if the assigning Lender's Advances are
evidenced by a Note) subject to such assignment. Upon such execution, delivery,
acceptance and recording and the receipt by the Administrative Agent from the
assignee of an assignment fee in the amount of $3,500 from and after the
effective date specified in such Assignment and Acceptance, (i) the assignee
thereunder shall become a party hereto and, to the extent that rights and
obligations under the Loan Documents have been assigned to such assignee
pursuant to such Assignment and Acceptance, have the rights and obligations of a
Lender, and if such Lender were an Issuer, of such Issuer hereunder and
thereunder, and (ii) the assignor thereunder shall, to the extent that rights
and obligations under this Agreement have been assigned by it pursuant to such
Assignment and Acceptance, relinquish its rights (except those which survive the
payment in full of the Obligations) and be released from its obligations to the
extent corresponding thereto under the Loan Documents, other than those relating
to events or circumstances occurring prior to such assignment (and, in the case
of an Assignment and Acceptance covering all or the remaining portion of an
assigning Lender's rights and obligations under the Loan Documents, such Lender
shall cease to be a party hereto).

          (c)    The Administrative Agent shall maintain at its address
referred to in Section 12.8 a copy of each Assignment and Acceptance delivered
to and accepted by it and a register for the recording of the names and
addresses of the Lenders and principal amount of the Advances owing to each
Lender from time to time (the "Register"). The entries in the Register shall be
conclusive and binding for all purposes, absent manifest error, and the Loan
Parties, the Administrative Agent and the Lenders may treat each Person whose
name is recorded in the Register as a Lender for all purposes of this Agreement.
The Register shall be available for inspection by the Borrower, the
Administrative Agent or any Lender at any reasonable time and from time to time
upon reasonable prior notice.

          (d)    Upon its receipt of an Assignment and Acceptance executed by
an assigning Lender and an assignee, the Administrative Agent shall, if such
Assignment and Acceptance has been completed, (i) accept such Assignment and
Acceptance, (ii) record the information contained therein in the Register and
(iii) give prompt notice thereof to the Borrower. Within five Business Days
after its receipt of such notice, the Borrower, at its own expense, shall, if
requested by such assignee, execute and deliver to the Administrative Agent, new
Notes to the order of such assignee in an amount equal to the Commitments
assumed by it pursuant to such Assignment and Acceptance and, if the assigning
Lender has surrendered any Note for exchange in connection with the assignment
and has retained Commitments hereunder, new Notes to the order of the assigning
Lender in an amount equal to the Commitments retained by it hereunder. Such new
Notes shall be dated the same date as the surrendered Notes and be in
substantially the form of Exhibit B.

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<PAGE>

          (e)    In addition to the other assignment rights provided in this
Section 12.2, each Lender may assign, as collateral or otherwise, any of its
rights under this Agreement (including rights to payments of principal or
interest on the Advances) to (i) any Federal Reserve Bank pursuant to Regulation
A of the Federal Reserve Board without notice to or consent of the Borrower or
the Administrative Agent and (ii) any trustee for the benefit of the holders of
such Lender's Securities; provided, however, that no such assignment shall
release the assigning Lender from any of its obligations hereunder.

          (f)    Each Lender may sell participations to one or more Persons in
or to all or a portion of its rights and obligations under the Loan Documents
(including all its rights and obligations with respect to the Advances). The
terms of such participation shall not, in any event, require the participant's
consent to any amendments, waivers or other modifications of any provision of
any Loan Documents, the consent to any departure by any Loan Party therefrom, or
to the exercising or refraining from exercising any powers or rights which such
Lender may have under or in respect of the Loan Documents (including the right
to enforce the obligations of the Loan Parties), except if any such amendment,
waiver or other modification or consent would (i) reduce the amount, or postpone
any date fixed for, any amount (whether of principal, interest or fees) payable
to such participant under the Loan Documents, to which such participant would
otherwise be entitled under such participation or (ii) result in the release of
all or substantially all of the Collateral other than in accordance with Section
11.7(b). In the event of the sale of any participation by any Lender, (A) such
Lender's obligations under the Loan Documents shall remain unchanged, (B) such
Lender shall remain solely responsible to the other parties for the performance
of such obligations, (C) such Lender shall remain the holder of such Obligations
for all purposes of this Agreement, and (D) the Borrower, the Administrative
Agent and the other Lenders shall continue to deal solely and directly with such
Lender in connection with such Lender's rights and obligations under this
Agreement. Each participant shall be entitled to the benefits of Sections
2.7(c), (e) and (f) and 2.9 as if it were a Lender; provided, however, that
anything herein to the contrary notwithstanding, the Borrower shall not, at any
time, be obligated to pay to any participant of any interest of any Lender,
under Section 2.7(c), (e) or (f) or 2.9, any sum in excess of the sum which the
Borrower would have been obligated to pay to such Lender in respect of such
interest had such participation not been sold.

          Section 12.3.    Costs and Expenses.
                           ------------------
          (a)    The Borrower agrees upon demand to pay, or reimburse the
Administrative Agent for, all of the Administrative Agent's reasonable internal
and external audit, legal, appraisal, valuation, filing, document duplication
and reproduction and investigation expenses and for all other reasonable and
documented out-of-pocket costs and expenses of every type and nature (including,
without limitation, the reasonable and documented fees, expenses and
disbursements of the Administrative Agent's counsel, Weil, Gotshal & Manges LLP
and Canadian counsel and additional local legal counsel, auditors, accountants,
appraisers, printers, insurance and environmental advisers, and other
consultants and agents) reasonably incurred by the Administrative Agent in
connection with (i) the Administrative Agent's audit and investigation of Terra
Industries and its Subsidiaries in connection with the preparation, negotiation
and execution of the Loan Documents and the Administrative Agent's periodic
audits of Terra Industries and its Subsidiaries, as the case may be; (ii) the
preparation, negotiation, execution and interpretation of this Agreement
(including, without limitation, the satisfaction or attempted satisfaction of
any of the conditions set forth in Article III), the Loan Documents and any
proposal letter or commitment letter issued in connection therewith and the
making or

                                       86
<PAGE>

assignment of the Advances hereunder; (iii) the creation, perfection or
protection of the Liens under the Loan Documents (including, without limitation,
any reasonable and documented fees and expenses for local counsel in various
jurisdictions); (iv) the ongoing administration of this Agreement and the
Advances, including consultation with attorneys in connection therewith and with
respect to the Administrative Agent's rights and responsibilities hereunder and
under the other Loan Documents; (v) the protection, collection or enforcement of
any of the Obligations or the enforcement of any of the Loan Documents; (vi) the
commencement, defense or intervention in any court proceeding relating in any
way to the Obligations, any Loan Party, any of Terra Industries' Subsidiaries,
this Agreement or any of the other Loan Documents; (vii) the response to, and
preparation for, any subpoena or request for document production with which the
Administrative Agent is served or deposition or other proceeding in which the
Administrative Agent is called to testify, in each case, relating in any way to
the Obligations, any Loan Party, any of Terra Industries' Subsidiaries, this
Agreement or any of the other Loan Documents; and (viii) any amendments,
consents, waivers, assignments, restatements, or supplements to any of the Loan
Documents and the preparation, negotiation, and execution of the same.

          (b)    The Borrower further agrees to pay or reimburse the
Administrative Agent and each of the Lenders upon demand for all reasonable and
documented out-of-pocket costs and expenses, including, without limitation,
reasonable attorneys' fees (including allocated costs of internal counsel and
costs of settlement), incurred by the Administrative Agent, such Lenders or
Issuers (i) in enforcing any Loan Document or Obligation or any security
therefor or exercising or enforcing any other right or remedy available by
reason of an Event of Default; (ii) in connection with any refinancing or
restructuring of the credit arrangements provided hereunder in the nature of a
"work-out" or in any insolvency or bankruptcy proceeding; (iii) in commencing,
defending or intervening in any litigation or in filing a petition, complaint,
answer, motion or other pleadings in any legal proceeding relating to the
Obligations, any Loan Party, any of Terra Industries' Subsidiaries and related
to or arising out of the transactions contemplated hereby or by any of the other
Loan Documents; and (iv) in taking any other action in or with respect to any
suit or proceeding (bankruptcy or otherwise) described in clauses (i) through
(iii) above.

          Section 12.4.    Indemnities.
                           -----------
          (a)    The Borrower agrees to indemnify and hold harmless the
Administrative Agent, each Lender and each of their respective Affiliates, and
each of the directors, officers, employees, agents, representative, attorneys,
consultants and advisors of or to any of the foregoing (including those retained
in connection with the satisfaction or attempted satisfaction of any of the
conditions set forth in Article III) (each such Person being an "Indemnitee")
from and against any and all claims, damages, liabilities, obligations, losses,
penalties, actions, judgments, suits, costs, disbursements and expenses of any
kind or nature (including reasonable and documented fees and disbursements of
counsel to any such Indemnitee, but excluding taxes (other than those covenanted
to be paid by the Borrowers under this Agreement) imposed on or measured by the
Indemnitee's net income and franchise taxes, imposed on it, by the jurisdiction
(or any political subdivision thereof) under the laws of which such Indemnitee
is organized or in which its principal office or Applicable Lending Office is
located) which may be imposed on, incurred by or asserted against any such
Indemnitee in connection with or arising out of any investigation, litigation or
proceeding, whether or not any such Indemnitee is a party thereto, whether
direct, indirect, or consequential and whether based on any federal, state or
local law or other statutory regulation, securities or commercial law or
regulation, or under common law or in equity, or in contract, tort or otherwise,
relating to or arising out of this Agreement, any other

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<PAGE>

Loan Document, any Obligation or any act, event or transaction related or
attendant to any thereof, or the use or intended use of the proceeds of the
Advances or in connection with any investigation of any potential matter covered
hereby (collectively, the "Indemnified Matters"). Without limiting the
foregoing, Indemnified Matters include (i) all Environmental Liabilities and
Costs arising from or connected with the past, present or future operations of
Terra Industries or any of its Subsidiaries involving any property subject to a
Collateral Document, or damage to real or personal property or natural resources
or harm or injury alleged to have resulted from any Release of Contaminants on,
upon or into such property or any contiguous real estate; (ii) any costs or
liabilities incurred in connection with any Remedial Action concerning Terra
Industries or any of its Subsidiaries; (iii) any costs or liabilities incurred
in connection with any Environmental Lien in respect of any assets or properties
of Terra Industries and its Subsidiaries; (iv) any costs or liabilities incurred
in connection with any other matter concerning Terra Industries or any of its
Subsidiaries under any Environmental Law, including CERCLA and applicable state
property transfer laws, whether, with respect to any of such matters, such
Indemnitee is a mortgagee pursuant to any leasehold mortgage, a mortgagee in
possession, the successor in interest to Terra Industries or any of its
Subsidiaries, or the owner, lessee or operator of any property of Terra
Industries or any of its Subsidiaries by virtue of foreclosure, except, with
respect to those matters referred to in clauses (i), (ii), (iii) and (iv) above,
to the extent incurred following (A) foreclosure by the Administrative Agent,
any Lender or any Issuer, or the Administrative Agent, any Lender or any Issuer
having become the successor in interest to Terra Industries or any of its
Subsidiaries, and (B) attributable solely to acts of the Administrative Agent,
such Lender or such Issuer or any agent on behalf of the Administrative Agent or
such Lender, provided, however, that the Borrower shall not have any obligation
under this Section 12.4 to an Indemnitee with respect to any Indemnified Matter
caused by or resulting from the gross negligence or willful misconduct of that
Indemnitee, as determined by a court of competent jurisdiction in a final non-
appealable judgment or order.

          (b)    The Borrower shall indemnify the Administrative Agent and the
Lenders for, and hold the Administrative Agent and the Lenders harmless from and
against, any and all claims for brokerage commissions, fees and other
compensation made against the Administrative Agent and the Lenders for any
broker, finder or consultant with respect to any agreement, arrangement or
understanding made by or on behalf of any Loan Party or any of its Subsidiaries
in connection with the transactions contemplated by this Agreement.

          (c)    The Borrower agrees that any indemnification or other
protection provided to any Indemnitee pursuant to this Agreement (including
pursuant to this Section 12.4) or any other Loan Document shall (i) survive
payment in full of the Obligations and (ii) inure to the benefit of any Person
who was at any time an Indemnitee under this Agreement or any other Loan
Document.

          Section 12.5.    Limitation of Liability.   The Borrower agrees that
                           -----------------------
no Indemnitee shall (except for breach by such Indemnitee of its obligations
under this Agreement and the other Loan Documents) have any liability (whether
direct or indirect, in contract, tort or otherwise) to any Loan Party or any of
their respective Subsidiaries or any of their equity holders or creditors for or
in connection with the transactions contemplated hereby and in the other Loan
Documents, except to the extent such liability is found in a final judgment by a
court of competent jurisdiction to have resulted from such Indemnitee's gross
negligence or willful misconduct. In no event, however, shall any Indemnitee be
liable on any theory of liability for any special, indirect, consequential or
punitive damages and each Obligor hereby waives, releases

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<PAGE>

and agrees (for itself and on behalf of its Subsidiaries) not to sue upon any
such claim for any such damages, whether or not accrued and whether or not known
or suspected to exist in its favor.

          Section 12.6.    Right of Set-off.  Upon the occurrence and during the
                           ----------------
continuance of any Event of Default each Lender and each Affiliate of a Lender
is hereby authorized at any time and from time to time, to the fullest extent
permitted by law, to set off and apply any and all deposits (general or special,
time or demand, provisional or final) at any time held and other indebtedness at
any time owing by such Lender or its Affiliates to or for the credit or the
account of each Obligor against any and all of the Obligations of such Obligor
now or hereafter existing whether or not such Lender shall have made any demand
under this Agreement or any other Loan Document and although such Obligations
may be unmatured.  Each Lender agrees promptly to notify the applicable Obligor
after any such set-off and application made by such Lender or its Affiliates;
provided, however, that the failure to give such notice shall not affect the
validity of such set-off and application.  The rights of each Lender under this
Section 12.6 are in addition to the other rights and remedies (including other
rights of set-off) which such Lender may have.

          Section 12.7.    Notices, Etc.  All notices, demands, requests and
                           ------------
other communications provided for in this Agreement shall be given in writing,
or by any telecommunication device capable of creating a written record, and
addressed to the party to be notified as follows:

          (a)     if to any Loan Party:

                  care of Terra Industries, Inc.,
                  600 Fourth Street
                  Sioux City, Iowa  51102
                  Attention:  Francis G. Meyer, Senior Vice President and
                              Chief Financial Officer
                  Telecopy no:  (712) 279-8703

          (b)    if to any Lender, at its Domestic Lending Office specified
opposite its name on Schedule II or on the signature page of any applicable
Assignment and Acceptance;

          (c)     if to the Administrative Agent:
                  (i) (for collateral and administrative matters)

                  Citibank, N.A.
                  399 Park Avenue
                  New York, New York  10043
                  Attention:  Suzanne Crymes
                  Telecopy No. (212) 793-1290

                  with a copy to (for collateral monitoring):

                  Citibank, N.A.
                  399 Park Avenue
                  New York, New York  10043
                  Attention:  Hien Nugent
                  Telecopy No. (212) 793-4806

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<PAGE>

                  And
                  (ii) (in relation to Advances)

                  Citibank, N.A.
                  2 Penns Way
                  Suite 200
                  New Castle, Delaware  19720
                  Attention:  Annemarie Pavco
                  Telecopy no:  (302) 894-6120

                  with a copy to:

                  Weil, Gotshal & Manges LLP
                  767 Fifth Avenue
                  New York, New York 10153-0119
                  Attention:  Daniel S. Dokos, Esq.
                  Telecopy no: (212) 310-8007

or at such other address as shall be notified in writing (i) in the case of the
Loan Parties and the Administrative Agent, to the other parties and (ii) in the
case of all other parties, to the Borrower and the Administrative Agent.  All
such notices and communications shall be effective upon personal delivery (if
delivered by hand, including any overnight courier service), when deposited in
the mails (if sent by mail), or when properly transmitted (if sent by a
telecommunications device); provided, however, that notices and communications
to the Administrative Agent pursuant to Article II or X shall not be effective
until received by the Administrative Agent.

          Section 12.8.    No Waiver; Remedies.  No failure on the part of any
                           -------------------
Lender, Issuer or the Administrative Agent to exercise, and no delay in
exercising, any right hereunder shall operate as a waiver thereof; nor shall any
single or partial exercise of any such right preclude any other or further
exercise thereof or the exercise of any other right. The remedies herein
provided are cumulative and not exclusive of any remedies provided by law.

          Section 12.9.    Binding Effect.  This Agreement shall become
                           --------------
effective when it shall have been executed by the Obligors and the
Administrative Agent and when the Administrative Agent shall have been notified
by each Lender that such Lender has executed it and thereafter shall be binding
upon and inure to the benefit of the Obligors, the Administrative Agent and each
Lender and their respective successors and assigns, except that the Obligors
shall not have the right to assign its rights hereunder or any interest herein
without the prior written consent of the Lenders.

          Section 12.10.    Governing Law.  This Agreement and the rights and
                            -------------
obligations of the parties hereto shall be governed by, and construed and
interpreted in accordance with, the law of the State of New York.

          Section 12.11.    Submission to Jurisdiction; Service of Process.
                            ----------------------------------------------
          (a)    Any legal action or proceeding with respect to this Agreement
or any other Loan Document may be brought in the courts of the State of New York
or of the United States of America for the Southern District of New York, and,
by execution and delivery of this Agreement, each Obligor hereby accepts for
itself and in respect of its property, generally and

                                       90
<PAGE>

unconditionally, the jurisdiction of the aforesaid courts. The parties hereto
hereby irrevocably waive any objection, including any objection to the laying of
venue or based on the grounds of forum non conveniens, which any of them may now
or hereafter have to the bringing of any such action or proceeding in such
respective jurisdictions.

          (b)    The Borrower and Terra UK each hereby irrevocably designates,
appoints and empowers Terra Industries (the "Process Agent"), in the case of any
suit, action or proceeding brought in the United States of America as its
designee, appointee and agent to receive, accept and acknowledge for and on its
behalf, and in respect of its property, service of any and all legal process,
summons, notices and documents that may be served in any action or proceeding
arising out of or in connection with this Agreement or any Loan Document. Such
service may be made by mailing (by registered or certified mail, postage
prepaid) or delivering a copy of such process to the Borrower and/or Terra UK
(as applicable) in care of the Process Agent at the Process Agent's above
address, and the Borrower and Terra UK hereby irrevocably authorizes and directs
the Process Agent to accept such service on its behalf. As an alternative method
of service, the Borrower and Terra UK each irrevocably consents to the service
of any and all process in any such action or proceeding by the mailing (by
registered or certified mail, postage prepaid) of copies of such process to the
Process Agent or the Borrower and/or Terra UK (as applicable) at its address
specified in Section 11.8. The Borrower agrees that a final judgment in any such
action or proceeding shall be conclusive and may be enforced in other
jurisdictions by suit on the judgment or in any other manner provided by law.
Each other Obligor hereby irrevocably consents to the service of any and all
legal process, summons, notices and documents in any suit, action or proceeding
brought in the United States of America arising out of or in connection with
this Agreement or any of the other Loan Documents by the mailing (by registered
or certified mail, postage prepaid) or delivering of a copy of such process to
such Obligor at its address specified in Section 12.8. Each such Obligor agrees
that a final judgment in any such action or proceeding shall be conclusive and
may be enforced in other jurisdictions by suit on the judgment or in any other
manner provided by law.

          (c)    Nothing contained in this Section 12.11 shall affect the
right of the Administrative Agent or any Lender to serve process in any other
manner permitted by law or commence legal proceedings or otherwise proceed
against the Obligors or any other Loan Party in any other jurisdiction.

          (d)    If for the purposes of obtaining judgment in any court it is
necessary to convert a sum due hereunder in Dollars into another currency, the
parties hereto agree, to the fullest extent that they may effectively do so,
that the rate of exchange used shall be that at which in accordance with normal
banking procedures the Administrative Agent could purchase Dollars with such
other currency at the spot rate of exchange quoted by the Administrative Agent
at 11:00 a.m. (New York time) on the Business Day preceding that on which final
judgment is given, for the purchase of Dollars, for delivery two Business Days
thereafter.

          Section 12.12.    Waiver of Jury Trial.  Each of the Administrative
                            --------------------
Agent, the Lenders and the Obligors irrevocably waives trial by jury in any
action or proceeding with respect to this Agreement or any other Loan Document.

          Section 12.13.    No Immunity.  To the extent that the Borrower or
                            -----------
Terra UK may be or become entitled, in any jurisdiction in which judicial
proceedings may at any time be commenced with respect to this Agreement, the
Notes or any other Loan Document, to claim for

                                       91
<PAGE>

itself or its properties or revenues any immunity from suit, court jurisdiction,
attachment prior to judgment, attachment in aid of execution of a judgment,
execution of a judgment or from any other legal process or remedy relating to
its respective obligations under this Agreement, the Notes or any other Loan
Document, and to the extent that in any such jurisdiction there may be
attributed such an immunity (whether or not claimed), the Borrower and Terra UK
each hereby irrevocably agrees not to claim and hereby irrevocably waives such
immunity to the fullest extent permitted by the laws of such jurisdiction.

          Section 12.14.    Judgment Currency.  This is an international loan
                            -----------------
transaction in which the specification of Dollars is of the essence, and Dollars
shall in each instance be the currency of account and payment in all instances.
A payment obligation in Dollars hereunder shall not be discharged by an amount
paid in another currency (the "Other Currency"), whether pursuant to any
judgment expressed in or converted into any Other Currency or in another place
except to the extent that such tender or recovery results in the effective
receipt by the Lenders of the full amount of Dollars payable to the
Administrative Agent, the Collateral Agent and the Lenders under this Agreement.
If for the purpose of obtaining judgment in any court it is necessary to convert
a sum due hereunder in Dollars into the Other Currency, the rate of exchange
that shall be applied shall be that at which in accordance with normal banking
procedures the Administrative Agent could purchase U.S. Dollars in New York, New
York with the Other Currency on the Business Day next preceding the day on which
such judgment is rendered. The obligation of the Borrower in respect of any such
sum due from it to the Administrative Agent, the Collateral Agent and the
Lenders hereunder or under any other Loan Document shall, notwithstanding the
rate of exchange actually applied in rendering such judgment, be discharged only
to the extent that on the Business Day following receipt by the Administrative
Agent, the Collateral Agent or any Lender of any sum adjudged to be due
hereunder in the Other Currency the Administrative Agent may in accordance with
normal banking procedures purchase Dollars with the amount of the judgment
currency so adjudged to be due; and the Borrower hereby, as a separate
obligation and notwithstanding any such judgment, agrees to indemnify the
Administrative Agent, the Collateral Agent and the Lenders against, and to pay
the Administrative Agent and Lenders on demand, in Dollars, the amount (if any)
by which the sum originally due to the Administrative Agent, the Collateral
Agent and the Lenders in Dollars hereunder exceeds the amount of the Other
Currency so purchased.

          Section 12.15.    Marshaling; Payments Set Aside.  None of the
                            ------------------------------
Administrative Agent or any Lender shall be under any obligation to marshal any
assets in favor of the Obligors or any other party or against or in payment of
any or all of the Obligations. To the extent that the Obligors make a payment or
payments to the Administrative Agent, the Lenders or the Issuers or any of such
Persons receives payment from the proceeds of the Collateral or exercise their
rights of setoff, and such payment or payments or the proceeds of such
enforcement or setoff or any part thereof are subsequently invalidated, declared
to be fraudulent or preferential, set aside or required to be repaid to a
trustee, receiver or any other party, then to the extent of such recovery, the
obligation or part thereof originally intended to be satisfied, and all Liens,
right and remedies therefor, shall be revived and continued in full force and
effect as if such payment had not been made or such enforcement or setoff had
not occurred.

          Section 12.16.    Section Titles.  The Section titles contained in
                            --------------
this Agreement are and shall be without substantive meaning or content of any
kind whatsoever and are not a part of the agreement between the parties hereto.

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<PAGE>

          Section 12.17.    Execution in Counterparts.  This Agreement may be
                            -------------------------
executed in any number of counterparts and by different parties in separate
counterparts, each of which when so executed shall be deemed to be an original
and all of which taken together shall constitute one and the same agreement.
Signature pages may be detached from multiple separate counterparts and attached
to a single counterpart so that all signature pages are attached to the same
document.

          Section 12.18.    Entire Agreement.  This Agreement, together with
                            ----------------
all of the other Loan Documents and all certificates and documents delivered
hereunder or thereunder, embodies the entire agreement of the parties and
supersedes all prior agreements and understandings relating to the subject
matter hereof.

          Section 12.19.    Confidentiality.  Each Lender and the
                            ---------------
Administrative Agent (a) agrees to keep information obtained by it pursuant
hereto and the other Loan Documents confidential in accordance with such
Lender's or the Administrative Agent's, as the case may be, customary practices
and (b) agrees that it will only use such information in connection with the
transactions contemplated by this Agreement and not disclose any of such
information other than (i) to such Lender's or the Administrative Agent's, as
the case may be, employees, representatives and agents who are or are expected
to be involved in the evaluation of such information in connection with the
transactions contemplated by this Agreement and who are advised of the
confidential nature of such information, (ii) to the extent such information
presently is or hereafter becomes available to such Lender or the Administrative
Agent, as the case may be, on a non-confidential basis from a source other than
the Borrower, (iii) to the extent disclosure is required by law, regulation or
judicial order or requested or required by bank regulators or auditors, or (iv)
to assignees or participants or potential assignees or participants who agree to
be bound by the provisions of this Section 12.19.

          Section 12.20.    Refund of Tax Credits.  If:
                            ---------------------
          (a)    Terra UK makes a payment under Section 2.9(a) (a "Tax
Payment") in respect of a payment to a Lender or the Administrative Agent under
this agreement; and

          (b)    that Lender or the Administrative Agent determines in its
discretion that it has obtained a refund of tax or obtained and used a credit
against tax on its overall net income (a "Tax Credit") which that Lender or as
appropriate the Administrative Agent in its discretion is able to identify as
attributable to that Tax Payment,

then if it can do so without any adverse consequences for that Lender or if
applicable the Administrative Agent, that Lender or if applicable the
Administrative Agent shall reimburse Terra UK such amount as that Lender or if
applicable the Administrative Agent determines to be such proportion of that Tax
Credit as will leave that lender or if applicable the Administrative Agent
(after that reimbursement) in no better or worse position in respect of its
overall tax liabilities that it would have been in if no Tax Payment had been
required.  A Lender or where applicable the Administrative Agent shall have an
absolute discretion as to whether to claim any Tax Credit (and, if it does
claim, the extent order and manner in which it does so).  Neither the Lender nor
the Administrative Agent should be obliged to disclose any of its tax affairs or
computations to Terra UK or any other Loan Party.

                                       93
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

                              THE BORROWER
                              ------------


                              TERRA INTERNATIONAL (CANADA) INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              GUARANTORS
                              ----------

                              TERRA INDUSTRIES INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Senior Vice President

                              TERRA CAPITAL HOLDINGS, INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              TERRA CAPITAL, INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              TERRA NITROGEN CORPORATION


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              TERRA INTERNATIONAL, INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Senior Vice President

                              TERRA METHANOL CORPORATION


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                                       94
<PAGE>

                              BMC HOLDINGS, INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              BEAUMONT HOLDINGS CORPORATION


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              TERRA NITROGEN (U.K.) LIMITED


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Secretary


                              TERRA NITROGEN, LIMITED PARTNERSHIP


                              By:  Terra Nitrogen Corporation, its General
                                   Partner


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              BEAUMONT METHANOL, LIMITED PARTNERSHIP


                              By:  TERRA METHANOL CORPORATION, as


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              BEAUMONT AMMONIA, INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              PORT NEAL CORPORATION


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                                       95
<PAGE>

                              TERRA INTERNATIONAL (OKLAHOMA) INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Corporate Secretary

                              TERRA (U.K.) HOLDINGS, INC.


                              By:  /S/ George H. Valentine
                                 -----------------------------------
                                       Title:  Vice President

                              THE ADMINISTRATIVE AGENT
                              ------------------------

                              CITIBANK, N.A.


                              By:  /S/ Suzanne A. Crymes
                                 -----------------------------------
                                       Title:  Vice President

                              THE LENDERS
                              -----------

                              CITIBANK, N.A.


                              By:  /S/ Suzanne A. Crymes
                                 -----------------------------------
                                       Title:  Vice President

                                       96
<PAGE>

                                  SCHEDULE I

             APPLICABLE LENDING OFFICES AND ADDRESSES FOR NOTICES
             ----------------------------------------------------



1.  Citibank, N.A.

    Domestic Lending Office:

    2 Penns Way
    Suite 200
    New Castle, Delaware 19720
    Attn: Annemarie Pavco
    Telecopy: 302 894 6120]

                                       97